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Share-Based Payments - Performance-Based Awards (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Minimum | Return on invested capital target  
Share-Based Payments  
Percentage of target achievement 0.00%
Maximum | Return on invested capital target  
Share-Based Payments  
Percentage of target achievement 100.00%
Performance units  
Share-Based Payments  
Expected life (in years) 3 years
Number of performance targets | item 2
Compensation expenses as percentage of performance target (as a percent) 100.00%
Performance-Based Awards (in shares)  
Granted (in shares) | shares 152,000
Forfeited (in shares) | shares (20,000)
Unvested at the end of the period (in shares) | shares 132,000
Performance-Based Awards (in dollars per share)  
Granted (in dollars per share) | $ / shares $ 23.45
Forfeited (in dollars per share) | $ / shares 23.45
Unvested at the end of the period (in dollars per share) | $ / shares $ 23.45
Performance-Based Awards (in years)  
Weighted Average Remaining Vesting Term (in Years) 2 years
Total unrecognized compensation costs related to unvested stock option awards | $ $ 2.0
Weighted average period for recognition of unvested awards 2 years
Performance units | Minimum  
Share-Based Payments  
Percentage of target shares 0.00%
Performance units | Minimum | Consolidated sales growth  
Share-Based Payments  
Percentage of target achievement 0.00%
Performance units | Maximum  
Share-Based Payments  
Percentage of target shares 200.00%
Performance units | Maximum | Consolidated sales growth  
Share-Based Payments  
Percentage of target achievement 100.00%