Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,134us-gaap_NetIncomeLoss	$ 488us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:
Change in fair value of derivatives, net of tax benefit (expense) of $(99) and $746, respectively	158	(1,217)
(Gain) loss from derivative transactions reclassified into earnings, net of tax (expense) benefit of $964 and $753, respectively	1,545	1,227
Amortization of prior service cost, net of tax benefit of $22 and $7, respectively	36	13
Amortization of actuarial loss, net of tax benefit of $9 and $51, respectively	14	80
Other comprehensive income (loss)	1,753	103
Total comprehensive income (loss)	$ 3,887us-gaap_ComprehensiveIncomeNetOfTax	$ 591us-gaap_ComprehensiveIncomeNetOfTax

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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