Stock-Based Compensation - Stock Option Plans (Details) - Employee and Directors Stock Options $ / shares in Units, $ in Thousands							3 Months Ended		9 Months Ended
	May 24, 2019 item $ / shares	Feb. 25, 2019 $ / shares	Nov. 21, 2018 $ / shares	Sep. 17, 2018 $ / shares	Jun. 01, 2018 $ / shares	Nov. 21, 2017 $ / shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Dec. 31, 2018 shares	Mar. 01, 2016 shares
Information relating to stock options
Number of different strike prices | item	3
Number of shares authorized | shares							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)		$ 10.86	$ 10.61	$ 11.03	$ 13.92	$ 9.74
Dividend Yield (as a percent)		2.52%	2.59%	2.55%	2.07%	2.77%
Risk-Free Interest Rate (as a percent)		2.47%	2.88%	2.89%	2.68%	2.06%
Expected Volatility (as a percent)		41.00%	41.00%	40.00%	41.00%	42.00%
Expected Life		5 years	5 years	5 years	5 years	5 years
Stock-based employee compensation expense | $							$ 198	$ 135	$ 529	$ 396
Remaining unrecognized compensation expense | $							$ 2,058		$ 2,058
Weighted average period for recognition									1 year 10 months 21 days
Activity under stock option plans, number of shares
Outstanding at beginning of the period (in shares) | shares									410,675
Granted (in shares) | shares									235,483
Exercised (in shares) | shares									(12,084)
Canceled (in shares) | shares									(134,183)
Outstanding at end of the period (in shares) | shares							499,891		499,891
Vested or expected to vest (in shares) | shares							455,889		455,889
Exercisable at end of period (in shares) | shares							230,540		230,540
Outstanding at end of period, Aggregate Intrinsic Value | $							$ 62		$ 62
Vested or expected to vest, Aggregate Intrinsic Value | $							56		56
Exercisable at end of the period, Aggregate Intrinsic Value | $							$ 1		$ 1
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)									45.80
Outstanding at end of period (in dollars per share)							$ 38.32		38.32
Vested or expected to vest (in dollars per share)							38.25		38.25
Exercisable at end of the period (in dollars per share)							$ 43.43		$ 43.43
Outstanding at end of the period, Weighted Average Remaining Contractual Life									7 years 7 months 13 days
Vested or expected to vest, Weighted Average Remaining Contractual Life									4 years 6 months 22 days
Exercisable at end of the period, Weighted Average Remaining Contractual Life									5 years 4 months 2 days
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
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
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
Stock Option Plan Adopted in January 2007
Information relating to stock options
Number of shares authorized | shares											500,000
Stock Option Plan Adopted In March 2016
Information relating to stock options
Number of shares authorized | shares												425,000