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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sac Holdings [Member]    
Property Management Fee [Abstract]    
Property Management Fee Revenue $ 17.5 $ 16.3
Sac Holdings [Member] | Minimum [Member]    
Property Management Fee [Abstract]    
Management fee rate 4.00%  
Sac Holdings [Member] | Maximum [Member]    
Property Management Fee [Abstract]    
Management fee rate 10.00%  
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Related party costs and expenses:    
Revenue, excluding dealer agreement commissions and expenses $ 12.8  
Expenses, related parties 1.3  
Cash flow, related party 11.3  
Revenue generated by the dealer agreement from related parties 167.8  
Commission expenses, generated from dealer agreement with related parties $ 35.9