Interest Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Interest Expense [Abstract]        
Revolving credit facility $ 246 $ 345 $ 497 $ 375
Amortization of debt issuance costs 100 50 194 70
Less, interest capitalized (346) (395) (691) (445)
Interest expense, net