S-K 1602(b)(6) Prospectus Summary, Sponsor Compensation - Willow Lane Sponsor II, LLC [Member]	Jan. 07, 2026 USD ($) $ / shares shares
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 25,000
Class B Ordinary Shares [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 5,259,857
Securities Issued or to be Issued, Shares (in Shares) \| shares	4,573,789
Private Placement Units [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 4,765,550
Securities Issued or to be Issued, Shares (in Shares) \| shares	476,555
Over-Allotment Option [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 5,140,550
Repayment of loans [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	300,000
Working capital loans [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 1,500,000
Price Paid or to be Paid for Securities, Per Share (in Dollars per share) \| $ / shares	$ 10

Willow Lane Acquisition Corp. II S-1