Segment Information - Schedule of Revenues and Long-Lived Assets by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 282,106	$ 286,816	$ 268,630	$ 283,073	$ 288,636	$ 290,227	$ 282,628	$ 310,240	$ 1,120,625	$ 1,171,731	$ 1,225,034
Long-Lived Assets	592,121				613,301				592,121	613,301	740,189
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									663,511	677,401	675,771
Long-Lived Assets	376,045				389,150				376,045	389,150	425,733
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									519,579	559,649	615,974
Long-Lived Assets	216,076				224,151				216,076	224,151	314,456
Intersegment Elimination [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(62,465)	(65,319)	(66,711)
Long-Lived Assets	$ 0				$ 0				$ 0	$ 0	$ 0