Stock-Based Compensation - Performance Shares and Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Nov. 21, 2017	Nov. 22, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	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)	$ 9.74	$ 11.50
Dividend Yield (as a percent)	2.77%	2.15%
Risk-Free Interest Rate (as a percent)	2.06%	1.79%
Expected Volatility (as a percent)	42.00%	37.00%
Expected Life	5 years	5 years
Stock-based employee compensation expense			$ 144	$ 105	$ 262	$ 224
Remaining unrecognized compensation expense			$ 1,098		$ 1,098
Weighted average period for recognition					1 year 11 months 27 days
Activity under stock option plans, number of shares
Outstanding at beginning of the period (in shares)					425,326
Granted (in shares)					57,550
Canceled (in shares)					(50,000)
Outstanding at end of the period (in shares)			432,876		432,876
Vested or expected to vest (in shares)			396,141		396,141
Exercisable at end of period (in shares)			316,776		316,776
Outstanding at end of period, Aggregate Intrinsic Value			$ 580		$ 580
Vested or expected to vest, Aggregate Intrinsic Value			564		564
Exercisable at end of the period, Aggregate Intrinsic Value			$ 272		$ 272
Weighted Average Exercise Prices
Outstanding at beginning of the period (in dollars per share)					$ 44.93
Granted (in dollars per share)					31.76
Exercised (in dollars per share)					0.00
Canceled (in dollars per share)					54.00
Outstanding at end of period (in dollars per share)			$ 43.47		43.47
Vested or expected to vest (in dollars per share)			41.98		41.98
Exercisable at end of the period (in dollars per share)			$ 44.51		$ 44.51
Outstanding at end of the period, Weighted Average Remaining Contractual Life					6 years 3 months 15 days
Vested or expected to vest, Weighted Average Remaining Contractual Life					6 years 3 months 4 days
Exercisable at end of the period, Weighted Average Remaining Contractual Life					5 years 3 months 26 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	24,800	19,000
Award vesting period	3 years	3 years
Fair value assumptions
Stock-based employee compensation expense			$ 185	$ 111	$ 314	$ 134
Remaining unrecognized compensation expense			$ 1,445		$ 1,445
Weighted average period for recognition					1 year 11 months 12 days
Weighted Average Exercise Prices
Granted (in dollars per share)	$ 38.43	$ 60.09