Derivatives and Hedging Activities - Summary of Outstanding Foreign Currency Contracts (Details) £ in Thousands, $ in Thousands	Jan. 27, 2019 USD ($) instrument	Jan. 27, 2019 GBP (£) instrument
Derivative [Line Items]
Number of Instruments	6	6
Sell USD/Buy GBP Forward Contract
Derivative [Line Items]
Number of Instruments	6	6
Sell USD/Buy GBP Forward Contract \| Sell
Derivative [Line Items]
Derivative Asset, Notional Amount \| $	$ 3,910
Sell USD/Buy GBP Forward Contract \| Buy
Derivative [Line Items]
Derivative Asset, Notional Amount \| £		£ 3,000

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Name:	us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant