Stock-Based Compensation - Stock Option Plans (Details) - Stock Options $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Nov. 24, 2015 $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) plan $ / shares shares	Mar. 31, 2015 USD ($)
Information relating to stock options
Number of plans | plan				2
Number of shares authorized		1,500,000		1,500,000
Period during which options are exercisable				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) | $ / shares	$ 8.37
Dividend Yield (as a percent)	2.33%
Risk-Free Interest Rate (as a percent)	1.70%
Expected Volatility (as a percent)	30.00%
Expected Life	5 years
Stock-based employee compensation expense | $		$ 127	$ 136	$ 260	$ 262
Remaining unrecognized compensation expense | $		$ 1,019		$ 1,019
Weighted average period for recognition				1 year 6 months 11 days
Activity under stock option plans, number of shares
Outstanding at beginning of the period (in shares)				358,601
Granted (in shares)	79,800			79,800
Exercised (in shares)				(10,000)
Outstanding at end of the period (in shares)		428,401		428,401
Vested or expected to vest (in shares)		256,729		256,729
Exercisable at end of period (in shares)		279,453		279,453
Outstanding at end of period, Aggregate Intrinsic Value | $		$ 257		$ 257
Vested or expected to vest, Aggregate Intrinsic Value | $		257		257
Exercisable at end of the period, Aggregate Intrinsic Value | $		$ 257		$ 257
Weighted Average Exercise Prices
Outstanding at beginning of the period (in dollars per share) | $ / shares				$ 50.37
Granted (in dollars per share) | $ / shares	$ 37.75			37.75
Exercised (in dollars per share) | $ / shares				31.00
Outstanding at end of period (in dollars per share) | $ / shares		$ 48.47		48.47
Vested or expected to vest (in dollars per share) | $ / shares		48.70		48.70
Exercisable at end of the period (in dollars per share) | $ / shares		$ 51.64		$ 51.64
Outstanding at end of the period, Weighted Average Remaining Contractual Life				5 years 11 months 23 days
Vested or expected to vest, Weighted Average Remaining Contractual Life				5 years 10 months 2 days
Exercisable at end of the period, Weighted Average Remaining Contractual Life				4 years 3 months 26 days
Original option plan August 2004
Information relating to stock options
Number of shares authorized		1,000,000		1,000,000
Second option plan January 2007
Information relating to stock options
Number of shares authorized		500,000		500,000