Derivatives and Hedging - Fair Value and Associated Notional Amounts (Details) - Cash Flow Hedges - USD ($)	Jan. 31, 2021	Jul. 31, 2020
Derivative [Line Items]
Notional	$ 595,644,000	$ 673,400,000
Fair value in other current liabilities	17,479,000	24,840,000
Interest rate swap agreements
Derivative [Line Items]
Notional	581,913,000	673,400,000
Fair value in other current liabilities	17,387,000	24,840,000
Foreign exchange forward
Derivative [Line Items]
Notional	13,731,000	0
Fair value in other current liabilities	$ 92,000	$ 0

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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