Other Comprehensive Income Other Comprehensive Income, Text (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Other Comprehensive Income (Loss), Tax [Abstract]
Net investment hedge translation adjustments	$ 1,029	$ (556)	$ 694	$ (2,125)
Cash flow hedges	78	(8)	(117)	(137)
Other income tax adjustments and currency translation	(71)	29	(26)	61
Income tax benefit (expense) related to items of other comprehensive income (loss)	827	(535)	342	(2,201)
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(44,682)	(54,745)
Other Comprehensive Income (Loss), before Reclassification			9,737	(13,450)
Amounts reclassified from accumulated other comprehensive income			(145)	(19)
Ending balance	(35,090)	(68,214)	(35,090)	(68,214)
Cash flow hedges
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			109	(857)
Other Comprehensive Income (Loss), before Reclassification			(598)	(80)
Amounts reclassified from accumulated other comprehensive income			126	(253)
Ending balance	(363)	(684)	(363)	(684)
Unamortized gain on post-retirement plans
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			2,620	2,236
Other Comprehensive Income (Loss), before Reclassification			382	72
Amounts reclassified from accumulated other comprehensive income			(271)	272
Ending balance	2,731	2,036	2,731	2,036
Foreign currency translation adjustments
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(47,411)	(56,124)
Other Comprehensive Income (Loss), before Reclassification			9,953	(13,442)
Amounts reclassified from accumulated other comprehensive income			0	0
Ending balance	$ (37,458)	$ (69,566)	$ (37,458)	$ (69,566)