Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Restricted Stock Activity (Details)

v3.7.0.1
Share-Based Payments - Restricted Stock Activity (Details) - All Plans - Restricted Stock
6 Months Ended
Mar. 31, 2017
$ / shares
shares
Restricted stock activity [Roll Forward]  
Non-vested at beginning of period (in shares) | shares 522,710
Granted (in shares) | shares 216,655
Vested (in shares) | shares (185,180)
Expired or forfeited (in shares) | shares (6,950)
Non-vested at end of period (in shares) | shares 547,235
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share) | $ / shares $ 45.10
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares 66.61
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares 47.24
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) | $ / shares 50.29
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) | $ / shares $ 52.83