Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive (Loss) Income, Balance, beginning			$ 748
Other comprehensive loss before reclassifications, net of tax			28
Amounts reclassified from accumulated other comprehensive income, net of tax			(43)
Net current-period other comprehensive loss, net of tax	$ (170)	$ (251)	15	$ 142
Accumulated Other Comprehensive (Loss) Income, Balance, ending	733		733
Pension and Postretirement Health Benefits
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive (Loss) Income, Balance, beginning			1,012
Other comprehensive loss before reclassifications, net of tax			0
Amounts reclassified from accumulated other comprehensive income, net of tax			(43)
Net current-period other comprehensive loss, net of tax			43
Accumulated Other Comprehensive (Loss) Income, Balance, ending	969		969
Cumulative Translation Adjustment
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive (Loss) Income, Balance, beginning			(264)
Other comprehensive loss before reclassifications, net of tax			28
Amounts reclassified from accumulated other comprehensive income, net of tax			0
Net current-period other comprehensive loss, net of tax			(28)
Accumulated Other Comprehensive (Loss) Income, Balance, ending	$ (236)		$ (236)