Segment Information Segment Informatin - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 295,278	$ 289,745	$ 282,426	$ 293,196	$ 297,499	$ 298,421	$ 287,780	$ 290,151	$ 1,160,645	$ 1,173,851	$ 1,113,316
Long-Lived Assets	557,158				560,348				557,158	560,348	588,876
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									674,924	663,935	651,294
Long-Lived Assets	365,205				366,638				365,205	366,638	367,418
OtherCountries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									546,923	573,652	521,791
Long-Lived Assets	191,953				193,710				191,953	193,710	221,458
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									(61,202)	(63,736)	(59,769)
Long-Lived Assets	$ 0				$ 0				$ 0	$ 0	$ 0