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Legal Proceedings and Contingencies - Additional Information (Detail) (Australia and New Zealand Discontinued Operations [Member], USD $)
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3 Months Ended | 35 Months Ended | |
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Nov. 30, 2012
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Nov. 30, 2012
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Aug. 31, 2012
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Australia and New Zealand Discontinued Operations [Member]
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| Loss Contingencies [Line Items] | |||
| Cash | $ 100,000 | $ 100,000 | |
| Other net assets | 600,000 | 600,000 | |
| Amount of proceeds in escrow | 2,000,000 | ||
| Number of equal installment payments release of escrow (in number of payments) | 4 | ||
| Escrowed payments received | 1,225,000 | ||
| Remaining escrowed payments | 775,000 | 775,000 | |
| Amount of claim filed by the purchaser of Company's Lane cave | 901,000 | ||
| Amount of issued written decision to award purchaser | 143,000 | ||
| Amount of allowance established to cover arbitrator's award and other cost | $ 163,000 | $ 163,000 |