Stock-based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended				6 Months Ended		3 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Sep. 30, 2012 Stock options	Sep. 30, 2011 Stock options	Sep. 30, 2012 Stock options plan	Sep. 30, 2011 Stock options	Sep. 30, 2012 Stock options Cost of sales	Sep. 30, 2011 Stock options Cost of sales	Sep. 30, 2012 Stock options Cost of sales	Sep. 30, 2011 Stock options Cost of sales	Sep. 30, 2012 Stock options Selling, general and administrative expenses	Sep. 30, 2011 Stock options Selling, general and administrative expenses	Sep. 30, 2012 Stock options Selling, general and administrative expenses	Sep. 30, 2011 Stock options Selling, general and administrative expenses	Sep. 30, 2012 Stock options Research and development	Sep. 30, 2012 Stock options Research and development	Sep. 30, 2012 Stock options Maximum	Sep. 30, 2012 Stock options Minimum	Sep. 30, 2012 Restricted stock	Sep. 30, 2011 Restricted stock	Sep. 30, 2012 Restricted stock	Sep. 30, 2011 Restricted stock	Sep. 30, 2012 Restricted stock Cost of sales	Sep. 30, 2012 Restricted stock Cost of sales	Sep. 30, 2012 Restricted stock Selling, general and administrative expenses	Sep. 30, 2011 Restricted stock Selling, general and administrative expenses	Sep. 30, 2012 Restricted stock Selling, general and administrative expenses	Sep. 30, 2011 Restricted stock Selling, general and administrative expenses	Sep. 30, 2012 Restricted stock and restricted stock units	Jun. 30, 2015 Chief executive officer Stock options	Jun. 30, 2014 Chief executive officer Stock options	Jun. 30, 2015 Chief executive officer Restricted stock	Jun. 30, 2014 Chief executive officer Restricted stock	Sep. 30, 2012 Board of directors Restricted stock and restricted stock units	Sep. 30, 2012 Executive leadership Restricted stock	Dec. 31, 2012 Non-management members of board of directors Restricted stock units	Sep. 30, 2012 2011 Incentive Plan Stock options	Sep. 30, 2012 Prior Plans Stock options	Sep. 30, 2012 LTIP Plans	Sep. 30, 2011 LTIP Plans	Sep. 30, 2012 LTIP Plans	Sep. 30, 2011 LTIP Plans	Sep. 30, 2012 LTIP Plans Cost of sales	Sep. 30, 2011 LTIP Plans Cost of sales	Sep. 30, 2012 LTIP Plans Cost of sales	Sep. 30, 2011 LTIP Plans Cost of sales	Sep. 30, 2012 LTIP Plans Selling, general and administrative expenses	Sep. 30, 2011 LTIP Plans Selling, general and administrative expenses	Sep. 30, 2012 LTIP Plans Selling, general and administrative expenses	Sep. 30, 2011 LTIP Plans Selling, general and administrative expenses	Sep. 30, 2012 LTIP Plans Research and development	Sep. 30, 2012 LTIP Plans Research and development	Sep. 30, 2012 LTIP Plans Restricted stock units	Sep. 30, 2012 LTIP Plans Time-based restricted stock units
Stock-based compensation, additional disclosure
Exercised (in shares)			21,000	52,000
Number of plans that reserved shares of common stock for issuance to executives and key employees			4
Shares authorized for grant	4,800,000		4,800,000																																4,000,000	800,000
Vesting period															3 years	1 year																1 year	4 years
Expiration period			10 years
Percentage of vesting																												0.50	0.50	0.50	0.50
Period of restriction for sale of shares																											90 days
Number of shares granted																																		50,000
Unrecognized compensation costs																	$ 2,600,000		$ 2,600,000
Percentage of plan based upon the achievement of an adjusted EDITDA target																																							60.00%
Performance period																																							2 years
Percentage of cash to be received by participants for performance portion																																							50.00%
Percentage in other than options to be received by participants for performance portion																																																			50.00%
Distribution percentage after the end of the performance period																																																			50.00%
Distribution percentage one year after the end of the performance period																																																			50.00%
Period after the end of the performance period when earnings will be distributed																																																			1 year
Remaining percentage of award in the form of other than options																																																				40.00%
Portion of award that vests per year (as a percent)																																	0.25																			0.33
Compensation expense (recovery) associated with stock-based compensation
Stock-based compensation expense	$ 488,000	$ 225,000	$ 972,000	$ 456,000	$ 214,000	$ 81,000	$ 426,000	$ 165,000	$ 242,000	$ 144,000	$ 496,000	$ 291,000	$ 32,000	$ 50,000			$ 477,000	$ 135,000	$ 996,000	$ 270,000	$ 121,000	$ 242,000	$ 356,000	$ 135,000	$ 754,000	$ 270,000											$ 277,000	$ 624,000	$ 538,000	$ 1,449,000	$ 88,000	$ 125,000	$ 156,000	$ 290,000	$ 161,000	$ 499,000	$ 334,000	$ 1,159,000	$ 28,000	$ 48,000