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Stock-based compensation (Tables) | 9 Months Ended
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Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of assumptions for stock options granted during period | We used the following weighted-average assumptions for our options granted during the nine months ended June 30, 2013:
Expected life of options | 5.0 years |
Expected volatility | 46.15 | %
Expected discrete dividends | — |
Weighted average risk-free interest rate | 0.63 | %
Weighted average fair value | $ | 5.48 |
Schedule of stock options and SSARs outstanding, as well as related activity | The following table summarizes stock options and SSARs outstanding as of June 30, 2013, as well as activity during the three and nine months then ended:
| Three Months Ended |  | Nine Months Ended
| June 30, 2013 |  | June 30, 2013
| Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price
Outstanding at beginning of period | 574,165 |  |  | $ | 32.75 |  |  | 429,965 |  |  | $ | 40.80 |
Granted | 5,086 |  |  | 20.58 |  |  | 160,651 |  |  | 13.56 |
Exercised | (503 | ) |  | 10.80 |  |  | (608 | ) |  | 10.80 |
Expired | — |  |  | — |  |  | (7,703 | ) |  | 96.45 |
Forfeited | (763 | ) |  | 12.56 |  |  | (4,320 | ) |  | 17.86 |
Outstanding at end of period | 577,985 |  |  | $ | 32.69 |  |  | 577,985 |  |  | $ | 32.69 |
Exercisable at end of period | 325,396 |  |  | $ | 47.52 |  |  | 325,396 |  |  | $ | 47.52 |
Vested or expected to vest in the future | 574,752 |  |  | $ | 32.79 |  |  | 574,752 |  |  | $ | 32.79 |
Schedule of nonvested stock awards activity | Activity relating to nonvested stock awards, including the Performance Shares for the three and nine months ended June 30, 2013 is as follows:
| Three Months Ended |  | Nine Months Ended
| June 30, 2013 |  | June 30, 2013
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Beginning of period | 374,753 |  |  | $ | 18.19 |  |  | 323,335 |  |  | $ | 19.61 |
Granted | 6,104 |  |  | 20.58 |  |  | 99,413 |  |  | 10.95 |
Vested | (94,471 | ) |  | 33.22 |  |  | (126,124 | ) |  | 27.59 |
Forfeited | (3,615 | ) |  | 13.30 |  |  | (13,853 | ) |  | 13.92 |
End of period | 282,771 |  |  | $ | 13.29 |  |  | 282,771 |  |  | $ | 13.29 |

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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