Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (45,034)	$ 64,156
Other comprehensive income (loss) before reclassification	(7,330)	(20,612)
Amounts reclassified from accumulated other comprehensive income	1,062	34,979
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0	34,697
Ending balance	(53,426)	8,565
Unrealized (loss) gain on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	9	(12)
Other comprehensive income (loss) before reclassification	60	418
Amounts reclassified from accumulated other comprehensive income	279	(13)
Ending balance	(210)	419
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	3,438	4,854
Other comprehensive income (loss) before reclassification	0	0
Amounts reclassified from accumulated other comprehensive income	783	295
Ending balance	2,655	4,559
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(48,481)	59,314
Other comprehensive income (loss) before reclassification	(7,390)	(21,030)
Amounts reclassified from accumulated other comprehensive income	0
Ending balance	$ (55,871)	$ 3,587