Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (71,254)	$ (56,401)
Other comprehensive loss (income) before reclassification	(20,089)	(11,188)
Amounts reclassified from accumulated other comprehensive loss	(899)	(857)
Ending balance	(92,242)
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	707	863
Other comprehensive loss (income) before reclassification	(1,363)	233
Amounts reclassified from accumulated other comprehensive loss	(584)	(434)
Ending balance	(1,240)	662
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(74,761)	(60,566)
Other comprehensive loss (income) before reclassification	(18,510)	(11,252)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(93,271)	(71,818)
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2,800	3,302
Other comprehensive loss (income) before reclassification	(216)	(169)
Amounts reclassified from accumulated other comprehensive loss	(315)	(423)
Ending balance	$ 2,269	2,710
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending balance		$ (68,446)