Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (55,953)	$ (66,477)
Other comprehensive income (loss) before reclassification	(4,186)	(3,484)
Amounts reclassified from accumulated other comprehensive loss	532	(293)
Ending balance	(60,671)	(69,668)
Unrealized gain on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	729	(200)
Other comprehensive income (loss) before reclassification	(273)	701
Amounts reclassified from accumulated other comprehensive loss	425	(159)
Ending balance	31	660
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,888	2,181
Other comprehensive income (loss) before reclassification	0	0
Amounts reclassified from accumulated other comprehensive loss	107	(134)
Ending balance	1,781	2,315
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(58,570)	(68,458)
Other comprehensive income (loss) before reclassification	(3,913)	(4,185)
Amounts reclassified from accumulated other comprehensive loss	0	0
Ending balance	$ (62,483)	$ (72,643)