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Commitments and Contingencies - Derecognition (Details) - USD ($) $ in Thousands	Jan. 27, 2019	Jan. 26, 2019	Oct. 31, 2018	Jul. 31, 2018	Feb. 28, 2018	Aug. 31, 2017
Sale Leaseback Transaction [Line Items]
Deferred gains on sale-leasebacks			$ 3,100	$ 10,700	$ 22,600	$ 15,400
Deferred tax asset		$ 33,181
As adjusted \| ASU 2016-02 \| Deferred rent
Sale Leaseback Transaction [Line Items]
Deferred gains on sale-leasebacks	$ 121,874
As adjusted \| ASU 2016-02 \| Financing Obligations
Sale Leaseback Transaction [Line Items]
Financing obligations	35,241
As adjusted \| ASU 2016-02 \| Property and equipment, net
Sale Leaseback Transaction [Line Items]
Build-to-suit assets	(22,777)
As adjusted \| ASU 2016-02 \| Noncurrent deferred tax asset
Sale Leaseback Transaction [Line Items]
Deferred tax asset	(32,743)
As adjusted \| ASU 2016-02 \| Several
Sale Leaseback Transaction [Line Items]
Other	(3,001)
As adjusted \| ASU 2016-02 \| Retained earnings
Sale Leaseback Transaction [Line Items]
Adjustment to retained earnings	$ (98,594)