Description of Organization and Business Operations - Additional Information (Detail) - USD ($)	Dec. 31, 2025	Oct. 01, 2025	Sep. 30, 2025	Mar. 31, 2026
Description of Organization and Business Operations [Line Items]
Sale of stock, price per share		$ 10
Underwriting fee net of reimbursement		$ 1,000,000
Offering costs		$ 735,700
Investment owned, net assets, percentage		80.00%
Price per public share		$ 10
Public shares redemption restriction percentage		15.00%
Public shares redemption obligation percentage		100.00%
Excise tax on stock repurchases percentage		1.00%
Dissolution expense limit		$ 100,000
Business Combination, Series of Individually Immaterial Business Combinations [Member]
Description of Organization and Business Operations [Line Items]
Business combination,interest in acquiree, percentage		50.00%
Minimum [Member]
Description of Organization and Business Operations [Line Items]
Price per Public share trust account		$ 10
Price per public share		$ 10
Securities Financing Transaction, Cost [Member]
Description of Organization and Business Operations [Line Items]
Transaction costs		$ 23,835,700
Cash Underwriting Fee [Member]
Description of Organization and Business Operations [Line Items]
Cash underwriting fee		7,000,000
Deferred Underwriting Fee [Member]
Description of Organization and Business Operations [Line Items]
Cash underwriting fee		$ 16,100,000
IPO [Member]
Description of Organization and Business Operations [Line Items]
Sale of stock, number of shares issued		46,000,000
Proceeds from issuance or sale of equity		$ 460,000,000
Private Placement [Member]
Description of Organization and Business Operations [Line Items]
Stock issued during period, shares, new issues		6,000,000
Shares issued, price per share		$ 11.5
Sale of stock, number of shares issued		900,000	900,000
Sale of stock, price per share		$ 10		$ 10
Proceeds from issuance of private placement	$ 9,000,000	$ 9,000,000
Common Stock [Member]
Description of Organization and Business Operations [Line Items]
Stock issued during period, shares, new issues		46,000,000
Shares issued, price per share		$ 10
Proceeds from issuance initial public offering		$ 460,000,000

Bain Capital GSS Investment Corp. 10-Q