CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 80,110	$ 2,987	$ (45,968)
Foreign currency translation adjustments:
Net (loss) gain recognized in other comprehensive (loss) income	(1,405)	(85,622)	4,543
Reclassification adjustment for (gains) losses included in net earnings (loss)	0	(34,697)	3,004
Total foreign currency translation adjustments	(1,405)	(120,319)	7,547
Net investment hedge translation adjustments	4,626	21,477	(4,243)
Long-term intercompany loan translation adjustments:
Net (loss) gain recognized in other comprehensive (loss) income	(6,906)	546	211
Reclassification adjustment for (gains) losses included in net (loss) earnings	0	(393)	865
Total long-term intercompany loan translation adjustments	(6,906)	153	1,076
Cash flow hedges:
Net (loss) gain recognized in other comprehensive (loss) income	(1,254)	1,643	8
Reclassification adjustment for gains (losses) included in net earnings (loss)	196	(1,325)	(147)
Total cash flow hedges	(1,058)	318	(139)
Pension and other post-retirement benefits:
Net (loss) gain recognized in other comprehensive (loss) income	(293)	1,057	5,211
Actuarial gain amortization	(612)	(741)	(240)
Prior service credit amortization	(1,035)	(1,170)	(203)
Reclassification adjustment for (gains) losses included in net earnings (loss)	0	(1,741)	131
Total pension and other post-retirement benefits	(1,940)	(2,595)	4,899
Other comprehensive (loss) income, before tax	(6,683)	(100,966)	9,140
Income tax (expense) benefit related to items of other comprehensive (loss) income	(3,028)	(8,224)	(1,047)
Other comprehensive (loss) income, net of tax	(9,711)	(109,190)	8,093
Comprehensive income (loss)	$ 70,399	$ (106,203)	$ (37,875)