Equity (Narrative) (Details)							1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 29, 2017 USD ($) shares	Dec. 14, 2016 USD ($) shares	Oct. 18, 2016 USD ($) shares	Jun. 24, 2016 USD ($)	Jun. 20, 2016 shares	Dec. 10, 2014 USD ($) employee shares	Jul. 31, 2016 shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2017 USD ($) plan $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	Jul. 05, 2016 $ / shares	Mar. 05, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive compensation plans maintained by the company | plan									3
Intrinsic value of shares exercised | $									$ 920,000	$ 87,000	$ 300,000
Dividends Payable, Amount Per Share | $ / shares												$ 1.50
Stock-based compensation expense | $									$ 3,602,000	$ 2,162,000	3,620,000
Preferred stock, shares issued (in shares)								0	0	0
Preferred stock, shares outstanding (in shares)								0	0	0
Cash matching contribution | $								$ 100,000	$ 500,000	$ 400,000	$ 200,000
Weighted average antidilutive options, unvested restricted stock units and awards, warrants and ESPP shares excluded from the computation (in shares)									398,000	508,000	1,391,000
ESPP, aggregate common shares issued									2,604,503
Purchases under the employee stock purchase plan (in shares)									911,071
Granted (in shares)									0
Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $									$ 0	$ (77,000)	$ 969,000
2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)									2,400,000
Shares authorized (in shares)									5,301,366
Maximum cash earned in connection with the grant | $									$ 1,000,000
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%
Annual contribution to ESPP, limitation | $									$ 25,000
ESPP, total shares							3,515,574						3,250,000
ESPP incremental increase in shares available							265,573.75
Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $				$ 300,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)										0
Stock-based compensation expense | $									$ 1,367,000	$ 0	0
Employee stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, average minimum vesting period (in years)									4 years
Stock options, average maximum vesting period (in years)									5 years
Stock options, contractual life (in years)									10 years
Unrecognized compensation expense | $									$ 100,000
Unrecognized compensation expense, period for recognition (in years)									2 years 9 months 22 days
Stock-based compensation expense | $									$ 45,000	$ 38,000	194,000
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number						56,000
Total incremental expense resulting from modifications | $						$ 200,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unamortized stock-based compensation expense | $									$ 100,000
Remaining unamortized stock-based compensation expense, period for recognition (in years)									3 years 18 days
Unvested restricted stock units (in shares)								0	8,154	0
Granted (in usd per share) | $ / shares									$ 8.20
Granted (in shares)									8,154
Vested (in shares)									0
Restricted Stock Awards [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	8,154
Grant date fair value | $	$ 100,000
Restricted Stock Awards [Member] | Minimum [Member] | Equity incentive plans 2012 and 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)									3 years
Restricted Stock Awards [Member] | Maximum [Member] | Equity incentive plans 2012 and 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)									4 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unamortized stock-based compensation expense | $									$ 3,400,000
Remaining unamortized stock-based compensation expense, period for recognition (in years)									2 years 3 months 4 days
Unvested restricted stock units (in shares)								878,416	778,084	878,416
Outstanding non-vested RSUs aggregate intrinsic value | $									$ 6,400,000
Outstanding non-vested RSUs weighted average remaining contractual term (in years)									1 year 3 months 2 days
Intrinsic value of RSUs vested | $									$ 3,400,000	$ 1,600,000	$ 4,600,000
Granted (in usd per share) | $ / shares									$ 8.44	$ 5.53	$ 5.38
Granted (in shares)									307,509
Vested (in shares)						300,000			357,013
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number						147,000
Number of employees affected during plan modification | employee						80
Total incremental expense resulting from modifications | $						$ 49,000
Restricted Stock Units [Member] | Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					150,000
Restricted Stock Units [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			61,846
Grant date fair value | $			$ 400,000
RSUs granted, prior to modification			70,000
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unamortized stock-based compensation expense, period for recognition (in years)									1 year 2 months 5 days
Unvested restricted stock units (in shares)								0	328,708	0
Intrinsic value of RSUs vested | $									$ 2,700,000
Granted (in usd per share) | $ / shares									$ 8.34
Granted (in shares)		71,669							366,849	0	0
Grant date fair value | $		$ 1,000,000
Unamortized stock based compensation | $									$ 1,400,000
Weighted average remaining contractual term, PSU									1 year 2 months 5 days
Vested (in shares)									0
Performance Stock Units [Member] | Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			195,180
Grant date fair value | $			$ 1,400,000
Performance Stock Units [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			100,000
PSUs eliminated during grant amendment			33,333
Grant date fair value | $			$ 700,000
Performance Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights		0.00%
Performance Stock Units [Member] | Minimum [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)									1 year
Performance Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights		200.00%
Performance Stock Units [Member] | Maximum [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)									3 years
Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unamortized stock-based compensation expense, period for recognition (in years)									2 years 5 days
Unvested restricted stock units (in shares)								0	33,333	0
Granted (in usd per share) | $ / shares									$ 12.25
Granted (in shares)									33,333
Unamortized stock based compensation | $									$ 400,000
Vested (in shares)									0
Performance Stock Awards [Member] | Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value | $	$ 400,000
Performance Stock Awards [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			33,333
401(k) match in common stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $									$ 0	$ 0	$ 284,000
Vesting October 18, 2020, Prior to Modification [Member] | Employee stock options [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									200,000
Vesting October 18, 2020, Prior to Modification [Member] | Stock Appreciation Rights (SARs) [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									200,000
Vesting October 18, 2020, Prior to Modification [Member] | Restricted Stock Awards [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									200,000
Vesting October 18, 2020, Prior to Modification [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights									20.00%
Vesting October 18, 2020, Prior to Modification [Member] | Restricted Stock Units [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									200,000
Vesting October 18, 2020, Prior to Modification [Member] | Restricted Stock Units [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted, prior to modification			17,500
Vesting October 18, 2020, Prior to Modification [Member] | Stock Purchase Rights [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									200,000
Vesting October 18, 2020, Prior to Modification [Member] | Share Awards [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									200,000
Vesting October 18, 2020, Post Modification [Member] | Employee stock options [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									400,000
Vesting October 18, 2020, Post Modification [Member] | Stock Appreciation Rights (SARs) [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									400,000
Vesting October 18, 2020, Post Modification [Member] | Restricted Stock Awards [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									400,000
Vesting October 18, 2020, Post Modification [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights									20.00%
Vesting October 18, 2020, Post Modification [Member] | Restricted Stock Units [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									400,000
Vesting October 18, 2020, Post Modification [Member] | Restricted Stock Units [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			9,346
Vesting October 18, 2020, Post Modification [Member] | Stock Purchase Rights [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									400,000
Vesting October 18, 2020, Post Modification [Member] | Share Awards [Member] | 2012 equity incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)									400,000
Share-based Compensation Award, Tranche Three [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights									20.00%
Share-based Compensation Award, Tranche Four [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights									20.00%
Share-based Compensation Award, Tranche Five [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights									20.00%
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock - ESPP (in shares)									133,000	193,000	121,000