Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (56,401)	$ (44,682)
Other comprehensive loss (income) before reclassification	(11,188)	(3,340)
Amounts reclassified from accumulated other comprehensive loss	857	(124)
Ending balance	(68,446)	(48,146)
Unrealized gain on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	863	109
Other comprehensive loss (income) before reclassification	233	(124)
Amounts reclassified from accumulated other comprehensive loss	434	(310)
Ending balance	662	295
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(60,566)	(47,411)
Other comprehensive loss (income) before reclassification	(11,252)	(3,630)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	(71,818)	(51,041)
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	3,302	2,620
Other comprehensive loss (income) before reclassification	(169)	414
Amounts reclassified from accumulated other comprehensive loss	423	434
Ending balance	$ 2,710	$ 2,600