Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit	$ 7,360
Intangible Assets, Gross (Excluding Goodwill)	81,460	$ 89,685
Finite-Lived Intangible Assets, Accumulated Amortization	(38,872)	(36,609)
Intangible Assets, Net (Excluding Goodwill)	42,588	53,076
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Assets	6,433	$ 7,113	$ 9,056
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	5,724
Finite-Lived Intangible Assets, Amortization Expense, Year Two	5,198
Finite-Lived Intangible Assets, Amortization Expense, Year Three	5,157
Finite-Lived Intangible Assets, Amortization Expense, Year Four	5,009
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 2,025
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Intangible Assets, Gross (Excluding Goodwill)	$ 1,448	$ 1,358
Finite-Lived Intangible Assets, Accumulated Amortization	(942)	(471)
Intangible Assets, Net (Excluding Goodwill)	$ 506	$ 887
Tradenames and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years	9 years
Intangible Assets, Gross (Excluding Goodwill)	$ 4,497	$ 4,528
Finite-Lived Intangible Assets, Accumulated Amortization	(4,395)	(4,229)
Intangible Assets, Net (Excluding Goodwill)	$ 102	$ 299
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years	8 years
Intangible Assets, Gross (Excluding Goodwill)	$ 55,999	$ 60,759
Finite-Lived Intangible Assets, Accumulated Amortization	(33,535)	(31,909)
Intangible Assets, Net (Excluding Goodwill)	22,464	28,850
Tradenames and Other - Indefinite Life [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	19,516	23,040
Finite-Lived Intangible Assets, Accumulated Amortization	0	0
Intangible Assets, Net (Excluding Goodwill)	$ 19,516	$ 23,040