Segment Information - Schedule of Revenues and Long-Lived Assets by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 288,636	$ 290,227	$ 282,628	$ 310,240	$ 316,733	$ 309,577	$ 291,194	$ 307,530	$ 1,171,731	$ 1,225,034	$ 1,157,792
Long-Lived Assets	613,301				740,189				613,301	740,189	896,245
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									677,401	675,771	615,861
Long-Lived Assets	389,150				425,733				389,150	425,733	576,539
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									559,649	615,974	602,582
Long-Lived Assets	224,151				314,456				224,151	314,456	319,706
Intersegment Elimination [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(65,319)	(66,711)	(60,651)
Long-Lived Assets	$ 0				$ 0				$ 0	$ 0	$ 0