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Stock-based compensation (Tables) | 9 Months Ended
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Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs | A summary of the expense related to stock-based compensation by award type is as follows for the periods presented:
|  | Three Months Ended June 30, |  | Nine Months Ended June 30, |
(In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Stock options expense |  | $ | 135 |  |  | $ | 171 |  |  | $ | 385 |  |  | $ | 528 |  |
Restricted stock awards expense |  | 1,921 |  |  | 1,468 |  |  | 5,459 |  |  | 4,042 |  |
Before tax stock-based compensation expense |  | 2,056 |  |  | 1,639 |  |  | 5,844 |  |  | 4,570 |  |
Tax benefit |  | (1,043 | ) |  | — |  | (a) | (2,891 | ) |  | — |  | (a)
After tax stock-based compensation expense |  | $ | 1,013 |  |  | $ | 1,639 |  |  | $ | 2,953 |  |  | $ | 4,570 |  |
(a) Tax impact is zero due to the existence of a valuation allowance on our deferred tax assets in prior year periods.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | We used the following assumptions for stock options granted, which derived the weighted average fair value shown, for the period presented:
|  | Nine Months Ended
|  | June 30, 2016
Expected life of options |  | 4.9 years |
Expected volatility |  | 46.50 | %
Expected dividends |  | — |
Weighted average risk-free interest rate |  | 1.38 | %
Weighted average fair value |  | $ | 3.98 |
Schedule of Stock Options and SSARs Outstanding, As Well As Related Activity | Activity related to stock options for the periods presented is as follows:
| Three Months Ended |  | Nine Months Ended
| June 30, 2016 |  | June 30, 2016
| Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding at beginning of period | 681,273 |  |  | $ | 17.89 |  |  | 643,907 |  |  | $ | 18.13 |
Granted | 74,474 |  |  | 7.53 |  |  | 115,074 |  |  | 9.90 |
Forfeited | (500 | ) |  | 7.32 |  |  | (3,734 | ) |  | 17.03 |
Outstanding at end of period | 755,247 |  |  | $ | 16.88 |  |  | 755,247 |  |  | $ | 16.88 |
Exercisable at end of period | 590,200 |  |  | $ | 18.04 |  |  | 590,200 |  |  | $ | 18.04 |
Vested or expected to vest in the future | 755,247 |  |  | $ | 16.88 |  |  | 755,247 |  |  | $ | 16.88 |
Schedule of Nonvested Stock Awards Activity | Activity relating to all restricted stock awards is as follows for the periods presented:
| Three Months Ended |  | Nine Months Ended
| June 30, 2016 |  | June 30, 2016
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Beginning of period | 1,281,662 |  |  | $ | 17.23 |  |  | 956,283 |  |  | $ | 18.27 |
Granted | — |  |  | — |  |  | 491,443 |  |  | 14.69 |
Vested | (4,156 | ) |  | 18.15 |  |  | (125,145 | ) |  | 18.61 |
Forfeited | (8,099 | ) |  | 17.11 |  |  | (53,174 | ) |  | 9.42 |
End of period | 1,269,407 |  |  | $ | 17.23 |  |  | 1,269,407 |  |  | $ | 17.23 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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