Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Intangible Assets
Impairment charges recognized					$ 0
Intangible Assets
Amortization expense of patents, non-competes and other intangibles	104	104	312	319
Total intangible assets, Gross Amount	8,660		8,660		13,887
Finite-lived intangible assets, Accumulated Amortization	(2,955)		(2,955)		(7,870)
Carrying Amount	5,705		5,705		6,017
Patents
Intangible Assets
Finite-lived intangible assets, Gross Amount	4,030		4,030		8,667
Finite-lived intangible assets, Accumulated Amortization	(2,463)		(2,463)		(6,891)
Finite-lived intangible assets, Carrying Amount	1,567		1,567		1,776
Patents | Minimum
Intangible Assets
Useful life			2 years
Patents | Maximum
Intangible Assets
Useful life			14 years
Non-compete
Intangible Assets
Useful life			2 years
Finite-lived intangible assets, Gross Amount	500		500		1,090
Finite-lived intangible assets, Accumulated Amortization	(363)		(363)		(900)
Finite-lived intangible assets, Carrying Amount	137		137		190
Other
Intangible Assets
Finite-lived intangible assets, Gross Amount	330		330		330
Finite-lived intangible assets, Accumulated Amortization	(129)		(129)		(79)
Finite-lived intangible assets, Carrying Amount	201		201		251
Trademarks
Intangible Assets
Indefinite-lived intangible assets	$ 3,800		$ 3,800		$ 3,800