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Dividends (Details) - USD ($)
6 Months Ended
Jul. 30, 2021
Sep. 30, 2021
Dividends.    
Dividends declared (in dollars per share) $ 1.00  
Dividends, Common Stock $ 40,400,000  
Dividends paid in cash 40,200,000 $ 40,207,344
Dividends payable $ 200,000 $ 230,090