Segment and Geographic Data (Details 3) (USD $)
In Millions, unless otherwise specified

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

Sep. 27, 2013

Consolidated Successor Company [Member]

Jun. 28, 2013

Consolidated Successor Company [Member]

Mar. 29, 2013

Consolidated Successor Company [Member]

Dec. 28, 2012

Consolidated Successor Company [Member]

Sep. 28, 2012

Consolidated Successor Company [Member]

Jun. 29, 2012

Consolidated Successor Company [Member]

Mar. 30, 2012

Consolidated Successor Company [Member]

Dec. 30, 2011

Consolidated Successor Company [Member]

Sep. 30, 2011

Consolidated Successor Company [Member]

Sep. 27, 2013

Consolidated Successor Company [Member]

Sep. 28, 2012

Consolidated Successor Company [Member]

Sep. 30, 2011

Consolidated Successor Company [Member]

U.S. [Member]

Sep. 27, 2013

Consolidated Successor Company [Member]

U.S. [Member]

Sep. 28, 2012

Consolidated Successor Company [Member]

U.S. [Member]

Sep. 30, 2011

Consolidated Successor Company [Member]

Other Americas [Member]

Sep. 27, 2013

Consolidated Successor Company [Member]

Other Americas [Member]

Sep. 28, 2012

Consolidated Successor Company [Member]

Other Americas [Member]

Sep. 30, 2011

Consolidated Successor Company [Member]

Europe [Member]

Sep. 27, 2013

Consolidated Successor Company [Member]

Europe [Member]

Sep. 28, 2012

Consolidated Successor Company [Member]

Europe [Member]

Sep. 30, 2011

Consolidated Successor Company [Member]

Asia-Pacific [Member]

Sep. 27, 2013

Consolidated Successor Company [Member]

Asia-Pacific [Member]

Sep. 28, 2012

Consolidated Successor Company [Member]

Asia-Pacific [Member]

Dec. 22, 2010

Combined Predecessor Company [Member]

Dec. 22, 2010

Combined Predecessor Company [Member]

U.S. [Member]

Dec. 22, 2010

Combined Predecessor Company [Member]

Other Americas [Member]

Dec. 22, 2010

Combined Predecessor Company [Member]

Europe [Member]

Dec. 22, 2010

Combined Predecessor Company [Member]

Asia-Pacific [Member]

Sep. 30, 2011

Global Pipe, Tube and Conduit [Member]

Consolidated Successor Company [Member]

Sep. 27, 2013

Global Pipe, Tube and Conduit [Member]

Consolidated Successor Company [Member]

Sep. 28, 2012

Global Pipe, Tube and Conduit [Member]

Consolidated Successor Company [Member]

Dec. 22, 2010

Global Pipe, Tube and Conduit [Member]

Combined Predecessor Company [Member]

Sep. 30, 2011

Global Pipe, Tube and Conduit [Member]

Conduit [Member]

Consolidated Successor Company [Member]

Sep. 27, 2013

Global Pipe, Tube and Conduit [Member]

Conduit [Member]

Consolidated Successor Company [Member]

Sep. 28, 2012

Global Pipe, Tube and Conduit [Member]

Conduit [Member]

Consolidated Successor Company [Member]

Dec. 22, 2010

Global Pipe, Tube and Conduit [Member]

Conduit [Member]

Combined Predecessor Company [Member]

Sep. 30, 2011

Global Pipe, Tube and Conduit [Member]

Pipe and Tube [Member]

Consolidated Successor Company [Member]

Sep. 27, 2013

Global Pipe, Tube and Conduit [Member]

Pipe and Tube [Member]

Consolidated Successor Company [Member]

Sep. 28, 2012

Global Pipe, Tube and Conduit [Member]

Pipe and Tube [Member]

Consolidated Successor Company [Member]

Dec. 22, 2010

Global Pipe, Tube and Conduit [Member]

Pipe and Tube [Member]

Combined Predecessor Company [Member]

Sep. 30, 2011

Global Cable and Cable Management [Member]

Consolidated Successor Company [Member]

Sep. 27, 2013

Global Cable and Cable Management [Member]

Consolidated Successor Company [Member]

Sep. 28, 2012

Global Cable and Cable Management [Member]

Consolidated Successor Company [Member]

Dec. 22, 2010

Global Cable and Cable Management [Member]

Combined Predecessor Company [Member]

Sep. 30, 2011

Global Cable and Cable Management [Member]

Cable [Member]

Consolidated Successor Company [Member]

Sep. 27, 2013

Global Cable and Cable Management [Member]

Cable [Member]

Consolidated Successor Company [Member]

Sep. 28, 2012

Global Cable and Cable Management [Member]

Cable [Member]

Consolidated Successor Company [Member]

Dec. 22, 2010

Global Cable and Cable Management [Member]

Cable [Member]

Combined Predecessor Company [Member]

Sep. 30, 2011

Global Cable and Cable Management [Member]

Cable Management Systems [Member]

Consolidated Successor Company [Member]

Sep. 27, 2013

Global Cable and Cable Management [Member]

Cable Management Systems [Member]

Consolidated Successor Company [Member]

Sep. 28, 2012

Global Cable and Cable Management [Member]

Cable Management Systems [Member]

Consolidated Successor Company [Member]

Dec. 22, 2010

Global Cable and Cable Management [Member]

Cable Management Systems [Member]

Combined Predecessor Company [Member]

Sep. 30, 2011

Intersegment Elimination [Member]

Consolidated Successor Company [Member]

Sep. 27, 2013

Intersegment Elimination [Member]

Consolidated Successor Company [Member]

Sep. 28, 2012

Intersegment Elimination [Member]

Consolidated Successor Company [Member]

Dec. 22, 2010

Intersegment Elimination [Member]

Combined Predecessor Company [Member]

Segment information by geographic area

Net sales

$ 381

$ 370

$ 355

$ 425

$ 393

$ 394

$ 337

$ 1,135

^[1]

$ 1,476

^[1]

$ 1,549

^[1]

$ 1,024

$ 1,338

$ 1,406

$ 40

$ 43

$ 46

$ 40

$ 39

$ 44

$ 31

$ 56

$ 53

$ 303

^[1]

$ 270

$ 12

$ 9

$ 720

^[1]

$ 910

^[1]

$ 954

^[1]

$ 190

^[1]

$ 389

$ 521

$ 533

$ 95

$ 331

$ 389

$ 421

$ 95

$ 434

^[1]

$ 606

^[1]

$ 634

^[1]

$ 119

^[1]

$ 266

$ 383

$ 389

$ 69

$ 168

$ 223

$ 245

$ 50

$ (19)

^[1]

$ (40)

^[1]

$ (39)

^[1]

$ (6)

^[1]

[1]	Amounts represent sales to external customers and related parties (see Note 3). No single customer represented 10% or more of the Company’s total net sales in any period presented.

Atkore International Holdings Inc. 10-K