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Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Income Taxes [Abstract]
Income tax expense	$ 7,496,000	$ 9,001,000	$ 16,732,000	$ 21,923,000
Estimated effective income tax rate			36.20%	35.30%
Favorable discrete item	$ 0	$ 0	$ 0	$ 0

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 740



-SubTopic 10



-Section 50



-Paragraph 13



-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319



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-Topic 235



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.4-08.(h)(2))



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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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-Subparagraph (a),(b)



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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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