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Stock-based compensation (Tables) | 3 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock options and SSARs outstanding | Following is a summary of stock option activity for the three months ended December 31, 2018:
| Three Months Ended
| December 31, 2018
| Shares |  | Weighted Average Exercise Price
Outstanding at beginning of period | 533,052 |  |  | $ | 14.26 |
Granted | 25,230 |  |  | 10.38 |
Exercised | (1,000 | ) |  | 7.56 |
Cancelled | (1,319 | ) |  | 11.53 |
Outstanding at end of period | 555,963 |  |  | $ | 14.10 |
Exercisable at end of period | 504,092 |  |  | $ | 14.13 |
Vested or expected to vest in the future | 552,799 |  |  | $ | 14.13 |
Schedule of nonvested stock awards activity | Following is a summary of restricted stock activity for the three months ended December 31, 2018:
| Three Months Ended December 31, 2018
| Performance-Based Restricted Shares |  | Time-Based Restricted Shares |  | Total Restricted Shares
Beginning of period | 644,785 |  |  | 431,783 |  |  | 1,076,568 |
Granted (a) | 467,819 |  |  | 441,991 |  |  | 909,810 |
Vested (a) | (309,843 | ) |  | (196,246 | ) |  | (506,089 | )
Forfeited | (7,020 | ) |  | (21,329 | ) |  | (28,349 | )
End of period | 795,741 |  |  | 656,199 |  |  | 1,451,940 |
(a) Grant and vesting activity during the three months ended December 31, 2018 include 86,050 shares that were issued above target based on the performance level achieved under performance-based restricted stock vesting in the current period. As of December 31, 2018 and September 30, 2018, total unrecognized compensation cost related to unvested restricted stock awards was $14.8 million and $8.8 million, respectively. The remaining cost as of December 31, 2018 is expected to be recognized over a weighted average period of 2.2 years.

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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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