Income Taxes - Deferred Income Taxes - Undistributed Earnings - Narrative (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Jul. 31, 2016	Aug. 02, 2015	May 01, 2016
Income Tax Disclosure [Abstract]
Undistributed earnings from our foreign subsidiaries that will not be reinvested indefinitely	$ 134,700,000	$ 88,600,000	$ 129,600,000
Deferred tax liability, undistributed earnings from foreign subsidiaries	431,000	2,000,000	604,000
U.S. income and foreign withholding taxes	39,800,000	33,800,000	38,500,000
U.S. foreign income tax credits	$ 39,400,000	$ 31,800,000	$ 37,900,000