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FAIR VALUE MEASUREMENTS - Additional Information (Details) - Convertible debt investments - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 02, 2022
Apr. 02, 2022
Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cost basis of investment $ 193.1 $ 193.1 $ 193.1
Unrealized gain on investment 0.1 0.4  
Investment income 0.9 1.7  
Amortized cost of investment $ 195.1 $ 195.1 $ 193.4