The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangible Assets (Identifiable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2013	Sep. 30, 2012
Carrying amount and accumulated amortization of identifiable intangible assets
Gross Carrying Amount	$ 22,530	$ 22,530
Accumulated Amortization	5,422	10,398
Net Carrying Amount	17,108	12,132
Amortization expense related to identifiable intangible assets	972us-gaap_AmortizationOfIntangibleAssets	4,977us-gaap_AmortizationOfIntangibleAssets	2,911us-gaap_AmortizationOfIntangibleAssets	1,798us-gaap_AmortizationOfIntangibleAssets
Developed product technologies [Member]
Carrying amount and accumulated amortization of identifiable intangible assets
Gross Carrying Amount	9,190	9,190
Accumulated Amortization	2,824	5,741
Net Carrying Amount	6,366	3,449
Customer Relationships [Member]
Carrying amount and accumulated amortization of identifiable intangible assets
Gross Carrying Amount	9,610	9,610
Accumulated Amortization	1,159	2,217
Net Carrying Amount	8,451	7,393
Trademarks [Member]
Carrying amount and accumulated amortization of identifiable intangible assets
Gross Carrying Amount	2,060	2,060
Accumulated Amortization	658	1,197
Net Carrying Amount	1,402	863
Covenants not to compete [Member]
Carrying amount and accumulated amortization of identifiable intangible assets
Gross Carrying Amount	1,670	1,670
Accumulated Amortization	781	1,243
Net Carrying Amount	$ 889	$ 427