Other Comprehensive Income Other Comprehensive Income, Text (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Other Comprehensive Income (Loss), Tax [Abstract]
Net investment hedge translation adjustments	$ (556)	$ (1,042)	$ (2,125)	$ (1,381)
Cash flow hedges	(8)	56	(137)	554
Other income tax adjustments and currency translation	29	7	61	(8)
Income tax expense related to items of other comprehensive loss	(535)	(979)	(2,201)	(835)
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(54,745)	(45,034)
Other Comprehensive Income (Loss), before Reclassification			(13,450)	(15,754)
Amounts reclassified from accumulated other comprehensive income			(19)	(1,567)
Ending balance	(68,214)	(62,355)	(68,214)	(62,355)
Cash flow hedges
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(857)	9
Other Comprehensive Income (Loss), before Reclassification			(80)	(141)
Amounts reclassified from accumulated other comprehensive income			253	209
Ending balance	(684)	(341)	(684)	(341)
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			2,236	3,438
Other Comprehensive Income (Loss), before Reclassification			72	0
Amounts reclassified from accumulated other comprehensive income			(272)	1,358
Ending balance	2,036	2,080	2,036	2,080
Foreign currency translation adjustments
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(56,124)	(48,481)
Other Comprehensive Income (Loss), before Reclassification			(13,442)	(15,613)
Amounts reclassified from accumulated other comprehensive income			0	0
Ending balance	$ (69,566)	$ (64,094)	$ (69,566)	$ (64,094)