Equity (Narrative) (Details)						1 Months Ended	12 Months Ended
	Oct. 18, 2016 USD ($) shares	Jun. 24, 2016 USD ($)	Jun. 20, 2016 shares	Jun. 15, 2015 USD ($) $ / shares shares	Dec. 10, 2014 USD ($) employee shares	Jul. 31, 2016 shares	Sep. 30, 2016 USD ($) plan $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($) $ / shares shares	Jul. 05, 2016 USD ($) $ / shares	Mar. 05, 2014 shares	Sep. 30, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends payable (in usd per share) | $ / shares										$ 1.50
Dividends payable | $										$ 39,200,000
Required liquidity after dividend payments | $							$ 25,000,000
Repurchases of common stock | $				$ 45,000,000			$ 0	$ 45,650,000	$ 0
Shares acquired (in shares)				6,900,000
Average cost per share (in usd per share) | $ / shares				$ 6.55
Repurchase costs | $				$ 700,000
Number of equity incentive compensation plans maintained by the company | plan							3
Intrinsic value of shares exercised | $							$ 87,000	300,000	100,000
Unvested restricted stock units (in shares)							878,416
Stock-based compensation expense | $							$ 2,162,000	$ 3,620,000	$ 2,987,000
Common stock, shares authorized (in shares)							50,000,000	50,000,000
Preferred stock, shares authorized (in shares)							5,882,000	5,882,000
Preferred stock, par value (in usd per share) | $ / shares							$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)							33,154,000	32,586,000
Common stock, shares outstanding (in shares)							26,244,000	25,676,000
Number of outstanding warrants (in shares)									400,001
Cash matching contribution | $							$ 400,000	$ 200,000
Weighted average antidilutive options, unvested restricted stock units and awards, warrants and ESPP shares excluded from the computation (in shares)							508,000	1,391,000	1,936,000
Aggregate common shares issued (in shares)							2,470,896
Purchases under the employee stock purchase plan (in shares)							1,044,678
Issuance of common stock - ODPP (in shares)							0	0	1,600
Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $							$ (100,000)	$ 1,000,000	$ 1,500,000
Employee stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, average minimum vesting period							4 years
Stock options, average maximum vesting period							5 years
Stock options, contractual life							10 years
Unrecognized compensation expense | $							$ 200,000
Unrecognized compensation expense, period for recognition							3 years 8 months 12 days
Number of shares affected (in shares)					56,000
Incremental expense (benefit) with modification | $					$ (200,000)
Stock-based compensation expense | $							$ 38,000	$ 194,000	135,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							3 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares affected (in shares)					147,000
Number of employees affected | employee					80
Incremental expense (benefit) with modification | $					$ 49,000
Remaining unamortized stock-based compensation expense | $							$ 2,600,000
Remaining unamortized stock-based compensation expense, period for recognition							2 years 4 months 24 days
Unvested restricted stock units (in shares)							878,416	570,231
Outstanding non-vested RSUs aggregate intrinsic value | $							$ 5,000,000
Outstanding non-vested RSUs weighted average remaining contractual term							1 year 4 months 24 days
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, vested | $							$ 1,600,000	$ 4,600,000	$ 2,400,000
Share-based compensation arrangement, by share-based payment award, options, vested and expected to vest, exercisable (in shares)							800,000
Share based compensation arrangement, by share based payment award, equity instruments other than options, expected to vest, intrinsic value | $							$ 4,700,000
Share based compensation arrangement, by share based payment award, equity investments other than options, expected to vest, weighted average contractual term							1 year 4 months 24 days
Granted (in usd per share) | $ / shares							$ 5.53	$ 5.38	$ 4.89
Granted (in shares)							449,250
Vested (in shares)					300,000		283,553
Employee stock purchase plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $							$ 223,000	$ 143,000	$ 289,000
401(k) match in common stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $							$ 0	$ 284,000	$ 513,000
Officer and Director Share Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)							125,000
2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental shares authorized (in shares)							500,000
Shares authorized (in shares)							2,500,000
Shares available for issuance (in shares)							921,527
Employee stock purchase plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan (ESPP), employee purchase price percentage							85.00%
Employee stock purchase plan (ESPP), annual employee contribution limit percentage							10.00%
Share-based compensation arrangement by share-based payment award accelerated compensation cost | $							$ 25,000
Total ESPP shares authorized (in shares)						3,515,574					3,250,000
Employee Stock Purchase Plan, Incremental Increase in Shares Available						265,574
Non-employee Directors [Member] | 2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum grant date fair value limit | $							250,000
Non-employee Directors serving as Chairman or Lead Independent Director [Member] | 2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum grant date fair value limit | $							$ 350,000
Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $		$ 300,000
Chief Financial Officer [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			150,000
Subsequent Event [Member] | Chief Financial Officer [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	195,180
Grant date fair value | $	$ 1,400,000
Subsequent Event [Member] | Chief Executive Officer [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	70,000
Grant date fair value | $	$ 400,000
Subsequent Event [Member] | Chief Executive Officer [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	100,000
Grant date fair value | $	$ 700,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding (in shares)							26,244,000	25,676,000	31,109,000			29,982,000
Issuance of common stock - ESPP (in shares)							193,000	121,000	341,000
Issuance of common stock - ODPP (in shares)									2,000
Minimum [Member] | Subsequent Event [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum [Member] | Subsequent Event [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%