Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 195,569	$ 235,865
Finite-Lived Intangible Assets, Accumulated Amortization	(126,681)	(144,851)
Intangible Assets, Net (Excluding Goodwill)	68,888	91,014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Assets	12,103	$ 17,871	$ 17,148
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	8,843
Finite-Lived Intangible Assets, Amortization Expense, Year Two	7,155
Finite-Lived Intangible Assets, Amortization Expense, Year Three	6,464
Finite-Lived Intangible Assets, Amortization Expense, Year Four	6,190
Finite-Lived Intangible Assets, Amortization Expense, Year Five	5,461
Impairment of Intangible Assets (Excluding Goodwill) [Abstract]
Impairment of Intangible Assets (Excluding Goodwill)	$ 6,651
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Intangible Assets, Gross (Excluding Goodwill)	$ 12,073	$ 11,656
Finite-Lived Intangible Assets, Accumulated Amortization	(10,641)	(10,160)
Intangible Assets, Net (Excluding Goodwill)	$ 1,432	$ 1,496
Tradenames and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Intangible Assets, Gross (Excluding Goodwill)	$ 14,375	$ 15,366
Finite-Lived Intangible Assets, Accumulated Amortization	(12,471)	(10,706)
Intangible Assets, Net (Excluding Goodwill)	$ 1,904	$ 4,660
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Intangible Assets, Gross (Excluding Goodwill)	$ 136,693	$ 168,525
Finite-Lived Intangible Assets, Accumulated Amortization	(94,537)	(114,363)
Intangible Assets, Net (Excluding Goodwill)	$ 42,156	$ 54,162
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years	4 years
Intangible Assets, Gross (Excluding Goodwill)	$ 9,076	$ 10,089
Finite-Lived Intangible Assets, Accumulated Amortization	(9,032)	(9,622)
Intangible Assets, Net (Excluding Goodwill)	44	467
Tradenames and Other - Indefinite Life [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	23,352	30,229
Finite-Lived Intangible Assets, Accumulated Amortization	0	0
Intangible Assets, Net (Excluding Goodwill)	$ 23,352	$ 30,229