Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Asset Impairments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Asset Impairments (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Impairment Effects on Earnings Per Share [Line Items]
Asset Impairment Charges	$ 0	$ 28,372	$ 0	$ 28,372
Goodwill
Impairment Effects on Earnings Per Share [Line Items]
Asset Impairment Charges				25,700
Finite-Lived Intangible Assets
Impairment Effects on Earnings Per Share [Line Items]
Asset Impairment Charges				$ 2,700