New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Recent Accounting Pronouncements
Other non-current assets	$ 94,421	$ 218,898
Long-term debt	3,851,082	3,702,157
Accounting Standards Update April 2015
Recent Accounting Pronouncements
Other non-current assets	(57,800)	(56,800)
Long-term debt	$ 57,800	$ 56,800

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H

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