Debt (Equipment Financing) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Total debt	$ 976,900	$ 977,155
Equipment Financing, due June 30, 2024 to July 5, 2029 \| Equipment Financings
Debt Instrument [Line Items]
Total debt	$ 48,096	$ 45,960
Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.53%
Minimum \| Equipment Financing, due June 30, 2024 to July 5, 2029 \| Equipment Financings
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.02%
Maximum \| Equipment Financing, due June 30, 2024 to July 5, 2029 \| Equipment Financings
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.07%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant