Document and Entity Information (USD $)	12 Months Ended
	Feb. 28, 2013	May 21, 2014	Aug. 31, 2012
Document Documentand Entity Information [Abstract]
Document Type	10-K/A
Amendment Flag	true
Document Period End Date	Feb. 28, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Entity Registrant Name	NGA Holdco, LLC
Entity Central Index Key	0001405621
Current Fiscal Year End Date	--02-28
Entity Filer Category	Smaller Reporting Company
Amendment Description	This amendment is due to errors discovered in the previously issued financial statements of one of the Company's equity method investees.
Entity Common Stock, Shares Outstanding		0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 0
Entity Current Reporting Status	Yes