Income Taxes - Liability For Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Apr. 26, 2020	Jan. 26, 2020
Income Tax Contingency [Line Items]
Total accrued taxes	$ 24,050	$ 24,130
Deferred tax assets - non-current
Income Tax Contingency [Line Items]
Total accrued taxes	15,626	15,575
Other long-term liabilities
Income Tax Contingency [Line Items]
Total accrued taxes	$ 8,424	$ 8,555

Amount recognized for uncertainty in income taxes classified as noncurrent.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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