Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	Jul. 31, 2016	May 01, 2016	Aug. 02, 2015
Income Taxes [Line Items]
Unrecognized tax benefits	$ 15,000,000	$ 14,900,000	$ 14,200,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	3,800,000	3,800,000	3,600,000
Expected increase in unrecognized tax benefits related to double taxation under applicable tax treaties with foreign tax jurisdictions	868,000
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	11,200,000	11,100,000	10,600,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 3,800,000	$ 3,800,000	$ 3,600,000