S-K 1602(a)(3) Forepart, Sponsor Compensation	Jan. 26, 2026 USD ($) $ / shares shares
Class B Ordinary Shares [Member]
Spac Offering Forepart Sponsor Compensation Line Items
Securities Issued or to be Issued, Shares	5,750,000
Sponsor [Member]
Spac Offering Forepart Sponsor Compensation Line Items
Price Paid or to be Paid for Securities, Total Amount \| $	$ 25,000
Price Paid or to be Paid for Securities, Per Share \| $ / shares	$ 0.0001
Sponsor [Member] \| Private Units [Member]
Spac Offering Forepart Sponsor Compensation Line Items
Securities Issued or to be Issued, Shares	350,000
Price Paid or to be Paid for Securities, Per Share \| $ / shares	$ 10.00
ClearThink 1 Sponsor Manager LLC [Member] \| Private Units [Member]
Spac Offering Forepart Sponsor Compensation Line Items
Securities Issued or to be Issued, Shares	350,000
Price Paid or to be Paid for Securities, Total Amount \| $	$ 3,500,000
ClearThink 1 Sponsor Manager LLC [Member] \| Class B Ordinary Shares [Member]
Spac Offering Forepart Sponsor Compensation Line Items
Securities Issued or to be Issued, Shares	5,750,000
Price Paid or to be Paid for Securities, Total Amount \| $	$ 25,000
Working Capital [Member]
Spac Offering Forepart Sponsor Compensation Line Items
Price Paid or to be Paid for Securities, Per Share \| $ / shares	$ 10.00

Clearthink 1 Acquisition Corp. S-1