Gift Cards - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015	Apr. 30, 2016
Gift Cards [Line Items]
Gift card breakage	$ 4,835	$ 5,198	$ 9,756	$ 10,588
Gift card liabilities	$ 344,044	$ 330,474	$ 344,044	$ 330,474	$ 353,103

The amount of breakage recognized related to unredeemed gift cards. Breakage occurs when a customer pays in advance of vendor performance and does not demand full performance for various reasons.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.B.Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68058157&loc=d3e18780-107790

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Breakage
-URI http://asc.fasb.org/extlink&oid=51574696

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration