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=121590274&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=121590274&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=121590274&loc=SL5579245-113959

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

Fair Value Measurements - Additional Information (Detail) £ in Thousands, $ in Thousands	Jan. 31, 2021 USD ($)	Jan. 31, 2021 GBP (£)	Jul. 31, 2020 USD ($)
Not designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	$ 34,431		$ 34,862
Foreign exchange forward
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	13,731	£ 10,000
Interest rate swap \| Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	581,913
Interest rate swap \| Not designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	$ 34,431