Stock-Based Compensation - Performance Shares and Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Nov. 22, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 01, 2016
Employee and Directors Stock Options
Information relating to stock options
Number of shares authorized		1,925,000		1,925,000
Expiration period				10 years
Vesting of awards per year (as a percent)				33.33%
Award vesting period				3 years
Fair value assumptions
Fair Value (in dollars per share)	$ 11.50
Dividend Yield (as a percent)	2.15%
Risk-Free Interest Rate (as a percent)	1.79%
Expected Volatility (as a percent)	37.00%
Expected Life	5 years
Stock-based employee compensation expense		$ 105	$ 127	$ 224	$ 260
Remaining unrecognized compensation expense		$ 1,036		$ 1,036
Weighted average period for recognition				2 years 5 months 23 days
Activity under stock option plans, number of shares
Outstanding at beginning of the period (in shares)				428,401
Granted (in shares)	47,925			47,925
Exercised (in shares)				0
Canceled (in shares)				(48,500)
Outstanding at end of the period (in shares)		427,826		427,826
Vested or expected to vest (in shares)		393,969		393,969
Exercisable at end of period (in shares)		299,667		299,667
Outstanding at end of period, Aggregate Intrinsic Value		$ 326		$ 326
Vested or expected to vest, Aggregate Intrinsic Value		323		323
Exercisable at end of the period, Aggregate Intrinsic Value		$ 306		$ 306
Weighted Average Exercise Prices
Outstanding at beginning of the period (in dollars per share)				$ 48.47
Granted (in dollars per share)	$ 40.86			40.86
Exercised (in dollars per share)				0.00
Canceled (in dollars per share)				71.76
Outstanding at end of period (in dollars per share)		$ 44.98		44.98
Vested or expected to vest (in dollars per share)		45.00		45.00
Exercisable at end of the period (in dollars per share)		$ 46.77		$ 46.77
Outstanding at end of the period, Weighted Average Remaining Contractual Life				6 years 26 days
Vested or expected to vest, Weighted Average Remaining Contractual Life				5 years 11 months 16 days
Exercisable at end of the period, Weighted Average Remaining Contractual Life				4 years 10 months 17 days
Employee and Directors Stock Options | Stock Option Plan Adopted in August 2004
Information relating to stock options
Number of shares authorized		1,000,000		1,000,000
Employee and Directors Stock Options | Stock Option Plan Adopted in January 2007
Information relating to stock options
Number of shares authorized		500,000		500,000
Stock Options and Stock Appreciation Rights
Information relating to stock options
Number of shares authorized						425,000
Performance Shares | Certain Employees
Information relating to stock options
Number of shares authorized	19,000
Award vesting period	3 years
Fair value assumptions
Stock-based employee compensation expense		$ 111	$ 0	$ 134	$ 0
Remaining unrecognized compensation expense		$ 1,007		$ 1,007
Weighted average period for recognition				2 years 6 months
Weighted Average Exercise Prices
Granted (in dollars per share)	$ 60.09