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Stock-based Compensation Plans, Share Options (Details) - Stock Options [Member]
3 Months Ended
Dec. 31, 2016
$ / shares
Executive and Management Options [Member]  
Fair Value of Stock Options using Black-Scholes-Merton Option-Pricing Model [Abstract]  
Expected life 4 years
Risk-free interest rate 1.55%
Volatility 61.43%
Dividend yield 0.00%
Weighted-average fair value per share (in dollars per share) $ 4.81
Executive Chairman Options [Member]  
Fair Value of Stock Options using Black-Scholes-Merton Option-Pricing Model [Abstract]  
Expected life 4 years
Dividend yield 0.00%
Executive Chairman Options [Member] | Minimum [Member]  
Fair Value of Stock Options using Black-Scholes-Merton Option-Pricing Model [Abstract]  
Risk-free interest rate 1.01%
Volatility 60.45%
Weighted-average fair value per share (in dollars per share) $ 3.56
Executive Chairman Options [Member] | Maximum [Member]  
Fair Value of Stock Options using Black-Scholes-Merton Option-Pricing Model [Abstract]  
Risk-free interest rate 1.93%
Volatility 64.40%
Weighted-average fair value per share (in dollars per share) $ 3.80