Stock-Based Compensation - Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands								12 Months Ended
	May 24, 2019	Feb. 25, 2019	Nov. 21, 2018	Sep. 17, 2018	Jun. 01, 2018	Nov. 21, 2017	Nov. 22, 2016	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Mar. 01, 2016
Employee and Directors Stock Options
Information relating to stock options
Number of shares authorized								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)		$ 10.86	$ 10.61	$ 11.03	$ 13.92	$ 9.74	$ 11.50
Dividend Yield (as a percent)		2.52%	2.59%	2.55%	2.07%	2.77%	2.15%
Risk-Free Interest Rate (as a percent)		2.47%	2.88%	2.89%	2.68%	2.06%	1.79%
Expected Volatility (as a percent)		41.00%	41.00%	40.00%	41.00%	42.00%	37.00%
Expected Life		5 years	5 years	5 years	5 years	5 years	5 years
Stock-based employee compensation expense								$ 764	$ 546	$ 433
Remaining unrecognized compensation expense								$ 1,823
Weighted average period for recognition								1 year 7 months 13 days
Activity under stock option plans, number of shares
Outstanding at beginning of the period (in shares)								410,675
Granted (in shares)								235,483
Exercised (in shares)								(12,084)
Canceled (in shares)								(151,683)
Outstanding at end of the period (in shares)								482,391	410,675
Vested or expected to vest (in shares)								439,999
Exercisable at end of period (in shares)								213,040
Outstanding at end of period, Aggregate Intrinsic Value								$ 682
Vested or expected to vest, Aggregate Intrinsic Value								630
Exercisable at end of the period, Aggregate Intrinsic Value								$ 84
Weighted Average Exercise Prices
Outstanding at beginning of the period (in dollars per share)								$ 42.72
Granted (in dollars per share)								33.86
Exercised (in dollars per share)								17.82
Canceled (in dollars per share)								45.79
Outstanding at end of period (in dollars per share)								38.05	$ 42.72
Vested or expected to vest (in dollars per share)								37.98
Exercisable at end of the period (in dollars per share)								$ 43.24
Outstanding at end of the period, Weighted Average Remaining Contractual Life								7 years 5 months 19 days
Vested or expected to vest, Weighted Average Remaining Contractual Life								4 years 4 months 17 days
Exercisable at end of the period, Weighted Average Remaining Contractual Life								5 years 1 month 21 days
Employee and Directors Stock Options | Exercise Price 1
Fair value assumptions
Fair Value (in dollars per share)	$ 8.75
Dividend Yield (as a percent)	2.88%
Risk-Free Interest Rate (as a percent)	2.11%
Expected Volatility (as a percent)	40.00%
Expected Life	5 years
Employee and Directors Stock Options | Exercise Price 2
Fair value assumptions
Fair Value (in dollars per share)	$ 7.94
Dividend Yield (as a percent)	2.88%
Risk-Free Interest Rate (as a percent)	2.11%
Expected Volatility (as a percent)	40.00%
Expected Life	5 years
Employee and Directors Stock Options | Exercise Price 3
Fair value assumptions
Fair Value (in dollars per share)	$ 7.23
Dividend Yield (as a percent)	2.88%
Risk-Free Interest Rate (as a percent)	2.11%
Expected Volatility (as a percent)	40.00%
Expected Life	5 years
Employee and Directors Stock Options | Stock Option Plan Adopted in January 2007
Information relating to stock options
Number of shares authorized								500,000
Stock Options and Stock Appreciation Rights
Information relating to stock options
Number of shares authorized											425,000