Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jul. 31, 2011	Jul. 31, 2010
Amortized other intangible assets:
Accumulated Amortization	$ (150,892)	$ (123,892)
Unamortized other intangible assets:
Gross Carrying Amount	240,853	227,438
Accumulated Amortization	(150,892)	(123,892)
Net Book Value	89,961	103,546
Patents [Member]
Amortized other intangible assets:
Amortized other intangible assets, weighted average amortization period (years)	5	5
Amortized other intangible assets, gross carrying amount	9,784	9,314
Accumulated Amortization	(8,556)	(7,855)
Amortized other intangible assets, net book value	1,228	1,459
Unamortized other intangible assets:
Accumulated Amortization	(8,556)	(7,855)
Trademarks and other [Member]
Amortized other intangible assets:
Amortized other intangible assets, weighted average amortization period (years)	7	7
Amortized other intangible assets, gross carrying amount	9,448	8,823
Accumulated Amortization	(6,599)	(5,685)
Amortized other intangible assets, net book value	2,849	3,138
Unamortized other intangible assets:
Accumulated Amortization	(6,599)	(5,685)
Customer relationships [Member]
Amortized other intangible assets:
Amortized other intangible assets, weighted average amortization period (years)	7	7
Amortized other intangible assets, gross carrying amount	165,566	152,720
Accumulated Amortization	(119,977)	(95,996)
Amortized other intangible assets, net book value	45,589	56,724
Unamortized other intangible assets:
Accumulated Amortization	(119,977)	(95,996)
Non-compete agreements and other [Member]
Amortized other intangible assets:
Amortized other intangible assets, weighted average amortization period (years)	4	4
Amortized other intangible assets, gross carrying amount	16,432	15,239
Accumulated Amortization	(15,760)	(14,356)
Amortized other intangible assets, net book value	672	883
Unamortized other intangible assets:
Accumulated Amortization	(15,760)	(14,356)
Trademarks [Member]
Unamortized other intangible assets:
Unamortized other intangible assets	$ 39,623	$ 41,342

Sum of the carrying amounts of both indefinite-lived and finite-lived intangible assets. The carrying amount of indefinite-lived intangible assets is the original costs for current and prior period additions, adjusted for impairments, if any, as of the balance sheet date. Balances are impacted by translation. The carrying amount of finite-lived intangible assets is the cost before accumulated amortization as of the balance sheet date.

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The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)

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- Definition

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)

+ Details

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- Definition

The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)

+ Details

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- Definition

The calculated weighted-average useful life of all finite-lived intangible assets.

+ Details

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Sum of the carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of intangible assets, excluding goodwill, having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph b

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 42, 45

+ Details

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