v3.10.0.1

Post-Retirement Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Defined Benefit Plan Disclosure [Line Items]
Employer contribution to defined contribution plan		$ 500,000	$ 500,000	$ 500,000
Defined Contribution Pension
Defined Benefit Plan Disclosure [Line Items]
Contributions to Plan		$ 1,400,000	1,100,000	1,200,000
401(k) Plan
Defined Benefit Plan Disclosure [Line Items]
Percentage of employer contribution for the first slab of employee contribution		100.00%
Percentage of employee contribution first slab		3.00%
Percentage of employee contribution second slab		2.00%
Matching contributions percentage		50.00%
Contribution related expenses recorded		$ 500,000	500,000	400,000
Subsequent Event \| 401(k) Plan \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Maximum matching contributions amount	$ 18,000
Foreign Plan \| Japan
Defined Benefit Plan Disclosure [Line Items]
Plan assets		0
Accrued expenses and other liabilities		300,000
Other non-current liabilities		6,900,000
Accumulated benefit obligation		7,149,000	$ 6,552,000	$ 6,912,000
Estimated future benefit payments in 2018		300,000
Estimated future benefit payments in 2019		400,000
Estimated future benefit payments in 2020		300,000
Estimated future benefit payments in 2021		300,000
Estimated future benefit payments in 2022		500,000
Estimated future benefit payments thereafter		$ 3,400,000
Forecast \| 401(k) Plan \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Maximum matching contributions amount	$ 18,500

Accrued Expenses and Other Current Liabilities

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Percentage of employee contribution first slab.

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Total Other Noncurrent Liabilities

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(ii)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

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-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
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-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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OCLARO, INC. 10-K