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.

+ References+ Details

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details

Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
Intangible Assets (Narrative) (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,659,000	$ 2,599,000	$ 4,752,000
Trade Names
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset	10 years
Supply Agreement
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset	15 years
Purchased Technology \| Minimum
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset	6 years
Purchased Technology \| Maximum
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset	7 years
Powell Canada
Finite Lived Intangible Assets [Line Items]
Loss on impairment of Goodwill	0	0
Loss on impairment of intangible assets			$ 7,200,000