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Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ 2,058 $ (5,452) $ 4,956 $ (5,200)
Other comprehensive income (loss) net of tax:        
Change in fair value of derivatives, net of tax benefit (expense) of $10, $408, $(147), and $272, respectively (17) (667) 239 (444)
Gain from derivative transactions reclassified into earnings, net of tax expense of $(92), $(14), $(1526), and $(586), respectively (149) (22) (2,490) (957)
Amortization of prior service cost, net of taxes of $8, $0, $25, and $0, respectively 13   41  
Amortization of actuarial loss, net of taxes of $209, $0, $627, and $0, respectively 341   1,023  
Other comprehensive income (loss) 188 (689) (1,187) (1,401)
Total comprehensive income (loss) $ 2,246 $ (6,141) $ 3,769 $ (6,601)