Accounting Standards (Details) - USD ($) $ in Thousands	Jul. 28, 2018	Jan. 28, 2018	Jan. 27, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 684,862	$ 630,400	$ 318,684
Contract assets	169,931	57,800	$ 369,500
Balances Without Adoption of ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	342,891
Contract assets	511,902
ASU 2014-09 | Adjustments for ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	341,971	$ 311,700
Contract assets	$ (341,971)