Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (55,953)	$ (66,477)
Other comprehensive loss before reclassification	(22,343)	14,777
Amounts reclassified from accumulated other comprehensive loss	(643)	239
Ending balance	(78,939)	(51,461)
Unrealized gain on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	729	(200)
Other comprehensive loss before reclassification	(142)	1,215
Amounts reclassified from accumulated other comprehensive loss	(453)	203
Ending balance	134	1,218
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,888	2,181
Other comprehensive loss before reclassification	(60)	(23)
Amounts reclassified from accumulated other comprehensive loss	(190)	36
Ending balance	1,638	2,194
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(58,570)	(68,458)
Other comprehensive loss before reclassification	(22,141)	13,585
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	$ (80,711)	$ (54,873)