CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 91,060	$ 95,645	$ 80,110
Foreign currency translation adjustments:
Net (loss) gain recognized in other comprehensive (loss) income	(11,195)	8,621	(1,405)
Total foreign currency translation adjustments	(11,195)	8,621	(1,405)
Net investment hedge and long-term intercompany loan translation adjustments:
Net loss recognized in other comprehensive (loss) income	(2,480)	(1,404)	(2,280)
Total long-term intercompany loan translation adjustments	(2,480)	(1,404)	(2,280)
Cash flow hedges:
Net gain (loss) recognized in other comprehensive (loss) income	966	(225)	(1,254)
Reclassification adjustment for losses included in net earnings	551	486	196
Total cash flow hedges	1,517	261	(1,058)
Pension and other post-retirement benefits:
Net gain (loss) recognized in other comprehensive (loss) income	446	647	(293)
Actuarial gain amortization	(576)	(483)	(612)
Prior service credit amortization	0	0	(1,035)
Total pension and other post-retirement benefits	(130)	164	(1,940)
Other comprehensive (loss) income, before tax	(12,288)	7,642	(6,683)
Income tax benefit (expense) related to items of other comprehensive (loss) income	569	2,421	(3,028)
Other comprehensive (loss) income, net of tax	(11,719)	10,063	(9,711)
Comprehensive income	$ 79,341	$ 105,708	$ 70,399