Commitments and Contingencies (Future Minimum Rental Payments under Capital Lease) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Capital Leased Assets [Line Items]
Remainder of 2019	$ 7,409
2020	11,762
2021	8,451
2022	5,859
2023	3,592
Thereafter	3,949
Total	41,022
Less amount representing interest (at rates ranging from 1.71% to 9.71%)	6,495
Present value of net minimum capital lease payments	34,527
Less current installments of obligations under capital leases	12,977	$ 12,236
Obligations under capital leases, excluding current installments	$ 21,550
Capital lease obligations \| Minimum
Capital Leased Assets [Line Items]
Capital leases of lessee, basis spread on variable rate	1.71%
Capital lease obligations \| Maximum
Capital Leased Assets [Line Items]
Capital leases of lessee, basis spread on variable rate	9.71%

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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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 more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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