Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) shares in Thousands	3 Months Ended
Jul. 28, 2018 shares
Purchase of treasury stock related to stock-based compensation, shares	132

Number of shares that have been repurchased and retired during the period.

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Name:	us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration