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Quarterly Financial Data - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | ||||
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Aug. 31, 2013
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May 31, 2013
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Aug. 31, 2012
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Aug. 31, 2013
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Aug. 31, 2012
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Aug. 31, 2011
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| Quantifying Misstatement in Current Year Financial Statements [Line Items] | ||||||
| Impairment charges | $ (11,200,000) | $ 170,000,000 | $ 62,500,000 | $ 158,817,000 | $ 62,464,000 | $ 0 |
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properly state deferred income tax balances associated with its equity compensation programs
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| Quantifying Misstatement in Current Year Financial Statements [Line Items] | ||||||
| Prior period reclassification adjustment | $ 10,600,000 | |||||
| X | ||||||||||
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- Definition
The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of each individual error being corrected in the correcting adjustment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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