CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 95,645	$ 80,110	$ 2,987
Foreign currency translation adjustments:
Net gain (loss) recognized in other comprehensive income (loss)	8,621	(1,405)	(85,622)
Reclassification adjustment for gains included in net earnings	0	0	(34,697)
Total foreign currency translation adjustments	8,621	(1,405)	(120,319)
Net investment hedge and long-term intercompany loan translation adjustments:
Net (loss) gain recognized in other comprehensive income (loss)	(1,404)	(2,280)	22,023
Reclassification adjustment for gains included in net earnings	0	0	(393)
Total long-term intercompany loan translation adjustments	(1,404)	(2,280)	21,630
Cash flow hedges:
Net (loss) gain recognized in other comprehensive income (loss)	(225)	(1,254)	1,643
Reclassification adjustment for losses (gains) included in net earnings	486	196	(1,325)
Total cash flow hedges	261	(1,058)	318
Pension and other post-retirement benefits:
Net gain (loss) recognized in other comprehensive income (loss)	647	(293)	1,057
Actuarial gain amortization	(483)	(612)	(741)
Prior service credit amortization	0	(1,035)	(1,170)
Reclassification adjustment for gains included in net earnings	0	0	(1,741)
Total pension and other post-retirement benefits	164	(1,940)	(2,595)
Other comprehensive income (loss), before tax	7,642	(6,683)	(100,966)
Income tax benefit (expense) related to items of other comprehensive income (loss)	2,421	(3,028)	(8,224)
Other comprehensive income (loss), net of tax	10,063	(9,711)	(109,190)
Comprehensive income (loss)	$ 105,708	$ 70,399	$ (106,203)