Segment Information - Schedule of Revenues and Long-Lived Assets by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 297,499	$ 298,421	$ 287,780	$ 290,151	$ 289,212	$ 275,927	$ 268,001	$ 280,176	$ 1,173,851	$ 1,113,316	$ 1,120,625
Long-Lived Assets	560,348				588,876				560,348	588,876	592,121
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									663,935	651,294	663,511
Long-Lived Assets	366,638				367,418				366,638	367,418	376,045
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									573,652	521,791	519,579
Long-Lived Assets	193,710				221,458				193,710	221,458	216,076
Intersegment Elimination [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(63,736)	(59,769)	(62,465)
Long-Lived Assets	$ 0				$ 0				$ 0	$ 0	$ 0