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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Earnings for basic computations $ 169,543 $ 153,742 $ 306,933 $ 245,418
Weighted-average common shares outstanding for basic computations (in shares) 132,266,373 134,759,240 132,317,689 135,158,270
Earnings for diluted computations $ 169,546 $ 153,745 $ 306,939 $ 245,422
Dilutive stock options and restricted stock (in shares) 462,872 557,189 551,452 689,278
Weighted-average common shares outstanding for diluted computations (in shares) 132,729,245 135,316,429 132,869,141 135,847,548
Earnings per common share        
Basic (in dollars per share) $ 1.28 $ 1.14 $ 2.32 $ 1.82
Diluted (in dollars per share) $ 1.28 $ 1.14 $ 2.31 $ 1.81
Unvested shares participating in the payment of the company's dividends declared (in shares) 1,100,000 1,000,000 1,000,000 800,000
Dividends $ 500 $ 400 $ 800 $ 600
Undistributed earnings allocated to participating securities, basic 900 700 1,400 900
Undistributed earnings allocated to participating securities, diluted $ 900 $ 700 $ 1,400 $ 900