Basis of Presentation and Accounting Policies (Details) $ in Millions	6 Months Ended
Jan. 27, 2018 USD ($) segment shares
Accounting Policies [Abstract]
Number of reportable segments \| segment	1
Cash tax benefit realized from option exercises and stock vestings \| $	$ 7.8
Adoption of accounting principled effect on diluted shares \| shares	177,575

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration