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Stock-Based Compensation Plans - Summary of Stock Options Outstanding (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 Years $ / shares shares | Sep. 30, 2015 Years $ / shares | Sep. 30, 2014 Years $ / shares | Sep. 30, 2013 Years $ / shares
Shares under option | shares | 263,560 |  |  |
Weighted average exercise price | $ 23.50 | $ 21.90 | $ 25.43 | $ 20.40
Weighted average remaining life | Years | 5.6 | 5.9 | 5.0 | 4.2
$16.51 - $24.75 Exercisable |  |  |  |
Shares under option | shares | 19,756 |  |  |
Weighted average exercise price | $ 16.72 |  |  |
Weighted average remaining life | Years | 5.2 |  |  |
Minimum exercise price | $ 16.51 |  |  |
Maximum exercise price | $ 24.75 |  |  |
$24.76 - $37.25 Exercisable |  |  |  |
Shares under option | shares | 142,473 |  |  |
Weighted average exercise price | $ 21.62 |  |  |
Weighted average remaining life | Years | 4.2 |  |  |
Minimum exercise price | $ 24.76 |  |  |
Maximum exercise price | $ 37.25 |  |  |
$37.26 - $41.39 Exercisable |  |  |  |
Shares under option | shares | 23,484 |  |  |
Weighted average exercise price | $ 31.11 |  |  |
Weighted average remaining life | Years | 7.7 |  |  |
Minimum exercise price | $ 37.26 |  |  |
Maximum exercise price | $ 41.39 |  |  |
$16.51 - $24.75 Non-exercisable |  |  |  |
Shares under option | shares | 5,539 |  |  |
Weighted average exercise price | $ 16.72 |  |  |
Weighted average remaining life | Years | 5.2 |  |  |
Minimum exercise price | $ 16.51 |  |  |
Maximum exercise price | $ 24.75 |  |  |
$24.76 - $37.25 Non-exercisable |  |  |  |
Shares under option | shares | 40,692 |  |  |
Weighted average exercise price | $ 23.99 |  |  |
Weighted average remaining life | Years | 7.4 |  |  |
Minimum exercise price | $ 24.76 |  |  |
Maximum exercise price | $ 37.25 |  |  |
$37.26 - $41.39 Non-exercisable |  |  |  |
Shares under option | shares | 31,616 |  |  |
Weighted average exercise price | $ 31.13 |  |  |
Weighted average remaining life | Years | 8.2 |  |  |
Minimum exercise price | $ 37.26 |  |  |
Maximum exercise price | $ 41.39 |  |  |
Exercisable |  |  |  |
Shares under option | shares | 185,713 |  |  |
Weighted average exercise price | $ 22.30 |  |  |
Weighted average remaining life | Years | 4.7 |  |  |
Non-exercisable |  |  |  |
Shares under option | shares | 77,847 |  |  |
Weighted average exercise price | $ 26.37 |  |  |
Weighted average remaining life | Years | 7.6 |  |  |

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