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Acquisitions (Pro Forma) (Details) - C.B. Fleet Company, Inc. - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pro Forma Information    
Revenues $ 1,049,473 $ 1,004,698
Net income $ 73,750 $ 92,712
Earnings per share:    
Basic (in USD per share) $ 1.39 $ 1.76
Diluted (in USD per share) $ 1.38 $ 1.74