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Summary of Impact of Adoption of New Accounting Pronouncements on Balance Sheets (Detail) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 28, 2018	Apr. 28, 2018	Jul. 29, 2017
Assets
Prepaid expenses and other current assets		$ 76,030	$ 65,153	$ 110,314
Liabilities and Shareholders' Equity
Accrued liabilities		256,588	260,209	265,400
Gift card liabilities	$ 223,950	223,950	323,465	337,965
Deferred taxes		72,147	52,044	83,785
Retained earnings		(174,086)	(216,236)	$ (67,131)
Calculated under Revenue Guidance in Effect before Topic 606 \| ASU 2014-09
Assets
Prepaid expenses and other current assets		74,466
Liabilities and Shareholders' Equity
Accrued liabilities		255,024
Gift card liabilities		314,097	323,465
Deferred taxes		52,044
Retained earnings		(244,130)
Difference between Revenue Guidance in Effect before and after Topic 606 \| ASU 2014-09
Assets
Prepaid expenses and other current assets		1,564
Liabilities and Shareholders' Equity
Accrued liabilities		1,564
Gift card liabilities		(90,147)	$ (90,147)
Deferred taxes		20,103
Retained earnings		$ 70,044