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Stock-based compensation (Tables)
 3 Months Ended
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.