Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (66,477)	$ (71,254)
Other comprehensive loss (income) before reclassification	18,014	(20,089)
Amounts reclassified from accumulated other comprehensive loss	(85)	(899)
Ending balance	(48,548)	(92,242)
Unrealized (loss) gain on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(200)	707
Other comprehensive loss (income) before reclassification	1,189	(1,363)
Amounts reclassified from accumulated other comprehensive loss	(16)	(584)
Ending balance	973	(1,240)
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	(69)	(315)
Ending balance	2,089	2,269
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(68,458)	(74,761)
Other comprehensive loss (income) before reclassification	16,848	(18,510)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	$ (51,610)	$ (93,271)