Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2025	Feb. 19, 2026	Jun. 30, 2025
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2025
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Current Fiscal Year End Date	--12-31
Entity File Number	001-42400
Entity Registrant Name	Willow Lane Acquisition Corp.
Entity Central Index Key	0002032379
Entity Tax Identification Number	00-0000000
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	250 West 57th Street
Entity Address, Address Line Two	Suite 415
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10107
City Area Code	(646)
Local Phone Number	565-3861
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Entity Shell Company	true
Entity Public Float			$ 129,409,500
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Auditor Opinion [Text Block]	We have audited the accompanying balance sheets of Willow Lane Acquisition Corp. as of December 31, 2025 and 2024, and the related statements of operations, changes in shareholders’ deficit, and cash flows for the year ended December 31, 2025 and the period from July 3, 2024 (Inception) through December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of Willow Lane Acquisition Corp. as of December 31, 2025 and 2024, and the results of its operations and its cash flows for the year then ended and the period from July 3, 2024 (Inception) through December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.
Auditor Name	WithumSmith+Brown, PC
Auditor Location	New York, New York
Auditor Firm ID	100
Units, each consisting of one Class A Ordinary Share and one-half of one Redeemable Warrant
Title of 12(b) Security	Units, each consisting of one Class A Ordinary Share and one-half of one Redeemable Warrant
Trading Symbol	WLACU
Security Exchange Name	NASDAQ
Class A Ordinary Shares, par value $0.0001 per share
Title of 12(b) Security	Class A Ordinary Shares, par value $0.0001 per share
Trading Symbol	WLAC
Security Exchange Name	NASDAQ
Redeemable Warrants, each whole warrant exercisable for one
Title of 12(b) Security	Redeemable Warrants, each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50
Trading Symbol	WLACW
Security Exchange Name	NASDAQ
Common Class A [Member]
Entity Common Stock, Shares Outstanding		12,650,000
Entity Listing, Par Value Per Share	$ 0.0001
Common Class B [Member]
Entity Common Stock, Shares Outstanding		4,628,674
Entity Listing, Par Value Per Share	$ 0.0001

Willow Lane Acquisition Corp. 10-K