Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	Jan. 25, 2020	Jan. 27, 2019	Jan. 26, 2019
Deferred tax assets	$ 339,617		$ 84,313
ASU 2016-02
Deferred tax assets		$ 32,700	$ 32,743

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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