Segment Information - Schedule of Revenues and Long-Lived Assets by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 289,212	$ 275,927	$ 268,001	$ 280,176	$ 282,106	$ 286,816	$ 268,630	$ 283,073	$ 1,113,316	$ 1,120,625	$ 1,171,731
Long-Lived Assets	588,876				592,121				588,876	592,121	613,301
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									651,294	663,511	677,401
Long-Lived Assets	367,418				376,045				367,418	376,045	389,150
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									521,791	519,579	559,649
Long-Lived Assets	221,458				216,076				221,458	216,076	224,151
Intersegment Elimination [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(59,769)	(62,465)	(65,319)
Long-Lived Assets	$ 0				$ 0				$ 0	$ 0	$ 0