General (Details) - USD ($)		3 Months Ended		12 Months Ended
	Aug. 09, 2022	Oct. 31, 2023	Oct. 31, 2022	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Dec. 07, 2023	Nov. 07, 2023	Nov. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating income (loss)		$ 2,086,000	$ (9,724,000)	$ (14,660,000)	$ (33,752,000)	$ (68,298,000)
Net cash used in operating activities		14,545,000	6,197,000	4,433,000	$ (1,997,000)	$ 40,638,000
Net loss		1,437,000	11,096,000
Cash and cash equivalents		18,116,000		18,961,000
Transition costs		0	9,090,000
CEO transition costs related to equity-classified stock-based awards		0	$ 3,764,000
Severance costs				$ 3,872,000
Former CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transition costs	$ 7,424,000
CEO transition costs related to equity-classified stock-based awards	3,764,000
Severance costs	3,660,000
Cash portion of transition costs	3,660,000
President and CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash sign-on bonus	$ 1,000,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash and cash equivalents							$ 18,000,000
Credit Facility | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Borrowings under credit facility							180,500,000
Credit Facility | Revolving Loan Facility
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Line of credit facility, maximum borrowing capacity									$ 150,000,000
Credit Facility | Revolving Loan Facility | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Line of credit facility, maximum borrowing capacity								$ 150,000,000
Credit Facility | Term Loan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Line of credit facility, maximum borrowing capacity									$ 300,000,000
Credit Facility | Line of Credit | Revolving Loan Facility | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Borrowings under credit facility							149,300,000
Credit Facility | Line of Credit | Term Loan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Line of credit facility, quarterly amortization		$ 1,250,000
Credit Facility | Line of Credit | Term Loan | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Borrowings under credit facility							$ 31,200,000
Line of credit facility, maximum borrowing capacity								$ 200,000,000