Goodwill and Other Intangible Assets Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges	$ 48,139
Amortization of Intangible Assets	17,871	17,148	10,576
Finite-Lived Intangible Asset, Useful Life			7 years
Intangible Assets, Gross (Excluding Goodwill)	235,865	333,681
Finite-Lived Intangible Assets, Accumulated Amortization	(144,851)	(176,830)
Intangible Assets, Net (Excluding Goodwill)	91,014	156,851
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	12,474
Finite-Lived Intangible Assets, Amortization Expense, Year Two	10,267
Finite-Lived Intangible Assets, Amortization Expense, Year Three	7,747
Finite-Lived Intangible Assets, Amortization Expense, Year Four	6,850
Finite-Lived Intangible Assets, Amortization Expense, Year Five	6,305
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Intangible Assets, Gross (Excluding Goodwill)	11,656	11,053
Finite-Lived Intangible Assets, Accumulated Amortization	(10,160)	(9,597)
Intangible Assets, Net (Excluding Goodwill)	1,496	1,456
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)	15,366	15,289
Finite-Lived Intangible Assets, Accumulated Amortization	(10,706)	(8,398)
Intangible Assets, Net (Excluding Goodwill)	4,660	6,891
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	8 years
Intangible Assets, Gross (Excluding Goodwill)	168,525	261,076
Finite-Lived Intangible Assets, Accumulated Amortization	(114,363)	(144,620)
Intangible Assets, Net (Excluding Goodwill)	54,162	116,456
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years	4 years
Intangible Assets, Gross (Excluding Goodwill)	10,089	14,942
Finite-Lived Intangible Assets, Accumulated Amortization	(9,622)	(14,215)
Intangible Assets, Net (Excluding Goodwill)	467	727
Tradenames and Other - Indefinite Life [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	30,229	31,321
Finite-Lived Intangible Assets, Accumulated Amortization	0	0
Intangible Assets, Net (Excluding Goodwill)	$ 30,229	$ 31,321