Acquisitions and dispositions - Dispositions (Details) - USD ($) $ in Thousands	12 Months Ended
Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2024
Acquisitions and dispositions
Gain (loss) on asset sales and disposals	$ (4,774)	$ (2,957)	$ (2,819)

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration