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, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 251,744	$ 265,943	$ 276,665	$ 286,947	$ 295,278	$ 289,745	$ 282,426	$ 293,196	$ 1,081,299	$ 1,160,645	$ 1,173,851
Long-Lived Assets	595,335				557,158				595,335	557,158	560,348
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									627,160	674,924	663,935
Long-Lived Assets	361,005				365,205				361,005	365,205	366,638
OtherCountries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									509,530	546,923	573,652
Long-Lived Assets	234,330				191,953				234,330	191,953	193,710
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									(55,391)	(61,202)	(63,736)
Long-Lived Assets	$ 0				$ 0				$ 0	$ 0	$ 0