Document and Entity Information - USD ($)	12 Months Ended
	Jul. 31, 2016	Oct. 24, 2016	Jan. 31, 2016
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jul. 31, 2016
Trading Symbol	goas
Entity Registrant Name	XIANGTIAN (USA) AIR POWER CO., LTD.
Entity Central Index Key	0001472468
Current Fiscal Year End Date	--07-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		591,042,000
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Entity Public Float			$ 450,023,849
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY