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Commitments and Contingencies - Leases: (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011
Operating Leases, Rent Expense, Net	$ 600,000	$ 700,000	$ 2,000,000	$ 2,000,000
Acquisition of equipment under capital lease			3,722,000	0
Capital lease obligations	$ 2,924,000		$ 2,924,000		$ 1,279,000

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

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