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Goodwill (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Jan. 26, 2017
Goodwill [Line Items]      
Goodwill $ 615,252 $ 615,451  
Goodwill impairment $ 0    
C.B. Fleet Company, Inc.      
Goodwill [Line Items]      
Goodwill     $ 268,577