Revenue and Contract Receivables, net, Remaining Performance Obligations (Details) $ in Millions	Jan. 26, 2019 USD ($)
Remaining Performance Obligations [Abstract]
Remaining performance obligations	$ 66.5
Remaining performance obligations expected to recognized in the next 12 months	$ 52.6
Remaining performance obligations expected to recognized in the next 12 months, percentage	79.00%

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

Name:	us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant