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Fire at Bus Production Facility - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 24 Months Ended
--- | --- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010 | Jul. 31, 2011
Fire At Bus Production Facility |  |  |  |
Amount deductible per the policy | $ 5,000 |  |  |
Insurance proceeds received |  | 10,203 | 13,313 |
Insurance recoveries recognized |  | 10,437 | 18,079 | 28,516
Insurance proceeds which included for business interruption |  | 6,315 |  |
Insurance recoveries, net of deductibles |  |  | 13,079 |
Advances recorded as deferred revenue |  |  | 234 |
Insurance proceeds recognized in current year, previously deferred |  | 234 |  |
Gain on involuntary conversion |  | 9,417 | 7,593 | 17,010
Cost incurred to reconstruct the Facility |  | $ 5,460 |  | $ 6,943

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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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