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Stock-based compensation (Tables) | 6 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock options and SSARs outstanding, as well as related activity | stock options/SSARs for the periods presented is as follows:
| Three Months Ended |  | Six Months Ended
| March 31, 2015 |  | March 31, 2015
| Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price
Outstanding at beginning of period | 650,223 |  |  | $ | 18.12 |  |  | 650,233 |  |  | $ | 18.12 |
Granted | — |  |  | — |  |  | — |  |  | — |
Exercised | (456 | ) |  | 12.07 |  |  | (456 | ) |  | 12.07 |
Expired | — |  |  | — |  |  | — |  |  | — |
Forfeited | (3,137 | ) |  | 20.32 |  |  | (3,147 | ) |  | 20.32 |
Outstanding at end of period | 646,630 |  |  | $ | 18.12 |  |  | 646,630 |  |  | $ | 18.12 |
Exercisable at end of period | 491,932 |  |  | $ | 18.39 |  |  | 491,932 |  |  | $ | 18.39 |
Vested or expected to vest in the future | 646,437 |  |  | $ | 18.12 |  |  | 646,437 |  |  | $ | 18.12 |
Schedule of nonvested stock awards activity | Activity relating to stock awards, including the Performance Shares, for the periods presented is as follows:
| Three Months Ended |  | Six Months Ended
| March 31, 2015 |  | March 31, 2015
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Beginning of period | 968,439 |  |  | $ | 18.31 |  |  | 746,567 |  |  | $ | 15.76 |
Granted | — |  |  | — |  |  | 390,870 |  |  | 19.07 |
Vested | (271 | ) |  | 18.85 |  |  | (63,078 | ) |  | 15.90 |
Forfeited | (14,560 | ) |  | 19.11 |  |  | (120,751 | ) |  | 6.39 |
End of period | 953,608 |  |  | $ | 18.29 |  |  | 953,608 |  |  | $ | 18.29 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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