Leases (Finance Lease Assets) (Details) - Equipment - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Gross carrying amount	$ 80,458	$ 69,760
Net carrying amount	$ 36,871	$ 36,337

Amount of lessee's right to use underlying asset under finance lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

Name:	us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant