Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, Beginning Balance	$ (45,034)	$ 64,156
Other comprehensive (loss) income before reclassification	(8,184)	(70,033)
Amounts reclassified from accumulated other comprehensive (loss) income	1,527	39,157
Accumulated other comprehensive (loss) income, Ending Balance	(54,745)	(45,034)
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, Beginning Balance	9	(12)
Other comprehensive (loss) income before reclassification	(986)	829
Amounts reclassified from accumulated other comprehensive (loss) income	120	808
Accumulated other comprehensive (loss) income, Ending Balance	(857)	9
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, Beginning Balance	(48,481)	59,314
Other comprehensive (loss) income before reclassification	(7,643)	(73,098)
Amounts reclassified from accumulated other comprehensive (loss) income	0	34,697
Accumulated other comprehensive (loss) income, Ending Balance	(56,124)	(48,481)
Other Postretirement Benefit Plan, Defined Benefit [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, Beginning Balance	3,438	4,854
Other comprehensive (loss) income before reclassification	445	2,236
Amounts reclassified from accumulated other comprehensive (loss) income	(1,647)	3,652
Accumulated other comprehensive (loss) income, Ending Balance	$ 2,236	$ 3,438