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Discontinued Operations - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |  | 4 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2010 | Apr. 30, 2013 | Apr. 30, 2011 | Jul. 31, 2013 | Apr. 30, 2013 | Apr. 30, 2012 | Jul. 31, 2011 | Apr. 30, 2011 | Apr. 30, 2013 Buses | Apr. 30, 2013 Buses | Jul. 31, 2013 Buses | Nov. 01, 2013 Scenario, Forecast | Apr. 30, 2013 Discontinued Operations Buses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected cash receipt from sale of business |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Amount deductible per policy | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries recognized |  |  |  |  |  |  | 10,437,000 |  |  |  |  |  |
Clean up and other costs |  |  |  |  |  |  | 1,020,000 |  |  |  |  |  |
Gain on involuntary conversion |  |  |  |  |  |  | 9,417,000 |  |  |  |  |  |
Amortizable intangible assets impairment charge |  |  | (1,430,000) | (11,525,000) |  |  | (1,430,000) |  |  |  |  |  | 4,715,000
Goodwill fair value |  |  |  |  |  |  |  |  |  |  | 0 |  |
Third quarter impairment |  |  |  |  | 0 | 0 |  | 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 |  |  |  |  |  |  |  |  |  |  |

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