Goodwill And Other Intangible Assets (Components Of Amortizable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Oct. 31, 2011	Jul. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 136,520	$ 138,010
Accumulated Amortization	14,112	12,755
Dealer Networks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	11
Cost	72,230	72,230
Accumulated Amortization	7,972	6,154
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	4
Cost	6,321	6,851
Accumulated Amortization	3,040	3,300
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	24
Cost	36,669	36,669
Accumulated Amortization	1,386	1,008
Design Technology And Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	13
Cost	21,300	22,260
Accumulated Amortization	$ 1,714	$ 2,293

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.

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)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

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