Stock-Based Compensation - Summary of Restricted Share and Performance-Based Stock Award Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Restricted shares
Common Shares
Shares, beginning of fiscal year (in shares)	160,335	80,446
Granted (in shares)	89,135	113,543
Vested and issued (in shares)	(62,685)	(25,729)
Forfeited (in shares)	(1,207)	(7,925)
Canceled (in shares)	0	0
Shares, end of period (in shares)	185,578	160,335
Vested, but not issuable at end of period (in shares)	32,759	24,480
Weighted-Average Grant Date Fair Value
Shares, beginning of fiscal year (in dollars per share)	$ 26.89	$ 18.18
Granted (in dollars per share)	19.57	30.95
Vested and issued (in dollars per share)	26.67	18.11
Forfeited (in dollars per share)	28.51	25.09
Canceled (in dollars per share)	0.00	0.00
Shares, end of period (in dollars per share)	32.94	26.89
Vested, but not issuable at end of period (in dollars per share)	$ 30.53	$ 26.14
Performance shares
Common Shares
Shares, beginning of fiscal year (in shares)	236,185	211,026
Granted (in shares)	40,204	43,371
Vested and issued (in shares)	0	(55)
Forfeited (in shares)	(1,317)	(18,157)
Canceled (in shares)	0	0
Shares, end of period (in shares)	275,072	236,185
Weighted-Average Grant Date Fair Value
Shares, beginning of fiscal year (in dollars per share)	$ 20.28	$ 18.00
Granted (in dollars per share)	39.43	30.78
Vested and issued (in dollars per share)	0.00	18.00
Forfeited (in dollars per share)	39.36	18.83
Canceled (in dollars per share)	0.00	0.00
Shares, end of period (in dollars per share)	$ 23.08	$ 20.28