Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Interest cost	$ 0	$ 338	$ 0	$ 673
Expected return on plan assets	0	(558)	0	(1,116)
Amortization of Other actuarial loss	0	19	0	28
Net periodic benefit cost	0	(201)	0	(415)
Postretirement Health Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	18	20	37	42
Interest cost	19	16	41	36
Amortization of Other actuarial loss	(29)	(23)	(53)	(41)
Amortization of Prior service costs	(1)	(1)	(3)	(3)
Net periodic benefit cost	$ 7	$ 12	$ 22	$ 34