Shareholders' Equity (Narrative) (Details) - shares	Jul. 31, 2016	May 29, 2015
Stockholders' Equity Note [Abstract]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		14,000,000.0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	10,504,199

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant