Basis of Presentation and Accounting Policies (Details) shares in Thousands, $ in Millions	3 Months Ended
Oct. 28, 2017 USD ($) segment shares
Accounting Policies [Abstract]
Number of reportable segments \| segment	1
Deferred tax asset	$ 28.2
Effective income tax rate reconciliation, adjustment related to shared based compensation	$ 0.9
Adoption of accounting principled effect on diluted shares \| shares	169

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant