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Discontinued Operations - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended
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Feb. 19, 2014 | Oct. 21, 2013 | Apr. 30, 2013 | Apr. 30, 2014 | Apr. 30, 2013 Buses | Apr. 30, 2013 Buses | Apr. 30, 2014 Buses | Apr. 30, 2014 Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of bus business |  | $ 100,000,000 |  | $ 105,043,000 |  |  |  |
Discontinued operation, amounts collected from ASV | 5,043,000 |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  | 7,079,000 |  |  |  |
Amortizable intangible assets impairment charge |  |  |  |  |  |  |  | 4,715,000
Goodwill fair value |  |  |  |  |  |  | 0 |
Third quarter impairment |  |  |  | 0 | 6,810,000 |  |  |
Impairment of goodwill and intangible assets |  |  |  |  |  | 11,525,000 |  |
Disposition of ambulance net assets |  |  | 12,051,000 |  |  |  |  |
Gain (loss) recognized on sale of assets |  |  | 0 |  |  |  |  |
Impact of indemnification to tax expenses |  |  |  | $ 1,883,000 |  |  |  |

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