S-K 1602(a)(3) Forepart, Sponsor Compensation - USD ($)	Sep. 26, 2025	Sep. 17, 2025
IG SPAC Sponsor LLC [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Per Share	$ 5
Private Placement Units [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)	300,000
Price Paid or to be Paid for Securities, Per Share	$ 5
Price Paid or to be Paid for Securities, Total Amount (in Dollars)	$ 1,500,000
Private Placement Units [Member] \| IG SPAC Sponsor LLC [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)	480,000
Private Placement Units One [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)	390,000
Private Placement Units One [Member] \| IG SPAC Sponsor LLC [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)	2,400,000
Over-Allotment Option [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount (in Dollars)	$ 1,950,000
Class B Ordinary Shares [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)	7,665,900
Price Paid or to be Paid for Securities, Total Amount (in Dollars)	$ 25,000
Class B Ordinary Shares [Member] \| Sponsor [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)		1,915,900
Class B Ordinary Shares Surrender [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)		750,000
Class B Ordinary Shares Surrender [Member] \| Sponsor [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares)		5,750,000