Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (66,477)	$ (71,254)
Other comprehensive loss (income) before reclassification	14,777	(661)
Amounts reclassified from accumulated other comprehensive loss	239	(575)
Ending balance	(51,461)
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(200)	707
Other comprehensive loss (income) before reclassification	1,215	468
Amounts reclassified from accumulated other comprehensive loss	203	(365)
Ending balance	1,218	810
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(68,458)	(74,761)
Other comprehensive loss (income) before reclassification	13,585	(913)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(54,873)	(75,674)
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2,181	2,800
Other comprehensive loss (income) before reclassification	(23)	(216)
Amounts reclassified from accumulated other comprehensive loss	36	(210)
Ending balance	$ 2,194	2,374
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		$ (72,490)