The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended		9 Months Ended
Intangible Assets and Goodwill (Details) (USD $)	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Jul. 31, 2014
Intangible assets with finite lives:
Amortization expense	$ 3,460,000us-gaap_AmortizationOfIntangibleAssets	$ 2,637,000us-gaap_AmortizationOfIntangibleAssets	$ 9,648,000us-gaap_AmortizationOfIntangibleAssets	$ 7,882,000us-gaap_AmortizationOfIntangibleAssets
Gross	142,452,000		142,452,000		127,432,000
Accumulated Amortization	(61,373,000)		(61,373,000)		(53,757,000)
Net	81,079,000us-gaap_FiniteLivedIntangibleAssetsNet		81,079,000us-gaap_FiniteLivedIntangibleAssetsNet		73,675,000us-gaap_FiniteLivedIntangibleAssetsNet
Intangible assets with indefinite lives:
Trademarks and trade names	8,350,000		8,350,000		9,277,000
Total intangible assets
Gross	150,802,000		150,802,000		136,709,000
Accumulated Amortization	(61,373,000)		(61,373,000)		(53,757,000)
Net	89,429,000		89,429,000		82,952,000
Minimum
Intangible assets with finite lives:
Estimated useful lives			1 year
Maximum
Intangible assets with finite lives:
Estimated useful lives			20 years
Weighted average
Intangible assets with finite lives:
Estimated useful lives			11 years
Customer relationships
Intangible assets with finite lives:
Gross	97,660,000		97,660,000		83,145,000
Accumulated Amortization	(37,333,000)		(37,333,000)		(31,336,000)
Net	60,327,000		60,327,000		51,809,000
Total intangible assets
Accumulated Amortization	(37,333,000)		(37,333,000)		(31,336,000)
Technology
Intangible assets with finite lives:
Gross	26,505,000		26,505,000		26,405,000
Accumulated Amortization	(11,852,000)		(11,852,000)		(11,444,000)
Net	14,653,000		14,653,000		14,961,000
Total intangible assets
Accumulated Amortization	(11,852,000)		(11,852,000)		(11,444,000)
Brand names
Intangible assets with finite lives:
Gross	13,020,000		13,020,000		12,680,000
Accumulated Amortization	(10,498,000)		(10,498,000)		(9,431,000)
Net	2,522,000		2,522,000		3,249,000
Total intangible assets
Accumulated Amortization	(10,498,000)		(10,498,000)		(9,431,000)
Non-compete agreements
Intangible assets with finite lives:
Gross	3,129,000		3,129,000		3,129,000
Accumulated Amortization	(936,000)		(936,000)		(754,000)
Net	2,193,000		2,193,000		2,375,000
Total intangible assets
Accumulated Amortization	(936,000)		(936,000)		(754,000)
Patents and other registrations
Intangible assets with finite lives:
Gross	2,138,000		2,138,000		2,073,000
Accumulated Amortization	(754,000)		(754,000)		(792,000)
Net	1,384,000		1,384,000		1,281,000
Total intangible assets
Accumulated Amortization	$ (754,000)		$ (754,000)		$ (792,000)