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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Management fees revenue:    
Management fees received exclusive of reimbursed expenses $ 17.4 $ 17.0
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member]    
Management fees revenue:    
Management fee rate 4.00% 4.00%
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member]    
Management fees revenue:    
Management fee rate 10.00% 10.00%
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member]    
Related party costs and expenses:    
Revenue, excluding dealer agreement commissions and expenses $ 12.5  
Expenses, related parties 1.3  
Cash flow, related parties 11.3  
Revenue generated by dealer agreement from related parties 161.2  
Commission expenses, generated from dealer agreement with related parties $ 34.8