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Fair Value Measurements (Narrative) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Assets fair value adjustments $ 0 $ 0 $ 0 $ 0
Liabilites fair value adjustments $ 0 $ 0 $ 0 $ 0