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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |
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Jul. 31, 2013 Segment | Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010 | Jul. 31, 2013 Trademarks | Jul. 31, 2013 Dealer networks | Jul. 31, 2013 Non-compete agreements | Jul. 31, 2013 Continuing Operations Selling, general and administrative expenses | Jul. 31, 2012 Continuing Operations Selling, general and administrative expenses | Jul. 31, 2011 Continuing Operations Selling, general and administrative expenses | Sep. 30, 2011 Minimum | Jul. 31, 2013 Minimum | Jul. 31, 2013 Minimum Trademarks | Jul. 31, 2013 Minimum Design technology assets | Jul. 31, 2013 Minimum Non-compete agreements | Jul. 31, 2013 Minimum Buildings and improvements | Jul. 31, 2013 Minimum Machinery and equipment | Jul. 31, 2013 Maximum | Jul. 31, 2013 Maximum Trademarks | Jul. 31, 2013 Maximum Dealer networks | Jul. 31, 2013 Maximum Design technology assets | Jul. 31, 2013 Maximum Non-compete agreements | Jul. 31, 2013 Maximum Buildings and improvements | Jul. 31, 2013 Maximum Machinery and equipment | Jul. 31, 2013 Held By One Financial Institution | Jul. 31, 2012 Held By One Financial Institution | Jul. 31, 2013 Held At Various Other Financial Institutions | Jul. 31, 2012 Held At Various Other Financial Institutions
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 236,601 | $ 218,642 | $ 215,435 | $ 247,751 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 217,965 | $ 183,615 | $ 18,636 | $ 35,027
Property, plant and equipment, estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 3 years |  |  |  |  |  | 39 years | 10 years |  |  |  |
Depreciation expense | 13,950 | 13,843 | 13,747 |  |  |  |  | 2,783 | 2,713 | 2,658 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period |  |  |  |  | 22 years | 9 years | 2 years |  |  |  |  |  | 20 years | 5 years | 5 years |  |  |  | 25 years | 12 years | 15 years | 15 years |  |  |  |  |  |
Self-insured retention for products liability and personal injury matters | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance retention for bus related matters | 7,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess liability insurance | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising costs | $ 8,794 | $ 6,989 | $ 6,168 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of tax benefits realized upon ultimate settlement | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Antidilutive stock options, unvested restricted stock and restricted stock units outstanding | 0 | 412,000 | 729,826 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage used to determine whether it is more likely than not that a reporting unit's fair value is less than its carrying amount |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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