Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands  | 
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2023  | 
Mar. 31, 2022  | 
Mar. 31, 2023  | 
Mar. 31, 2022  | 
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| Statement of Comprehensive Income [Abstract] | ||||
| Net gains/(losses) on cash flow hedge, tax | $ (1,630) | $ 3,814 | $ (2,979) | $ 4,772 | 
| X | ||||||||||
- Definition Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- References No definition available. 
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