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Unaudited Pro Forma Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Business Combinations [Abstract]    
Revenue $ 1,558,342 $ 1,471,350
Net Earnings $ 50,189 $ 66,377
Earnings Per Share – basic $ 1.19 $ 1.42
Earnings Per Share - diluted $ 1.19 $ 1.41