Financial Instruments - Other Comprehensive Income (Details) - Interest rate agreements $ in Thousands	12 Months Ended
Sep. 30, 2021 USD ($)
Expected Earnings [Line Items]
2022	$ (2,959)
2023	(2,959)
2024	(2,959)
2025	(2,959)
2026	(2,959)
Thereafter	(46,919)
Total	$ (61,714)

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994

Name:	us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration