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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Property Management Fee [Abstract]    
Property Management Fee Revenue $ 19.4 $ 17.5
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member]    
Property Management Fee [Abstract]    
Management fee rate 4.00%  
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member]    
Property Management Fee [Abstract]    
Management fee rate 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 $ 14.6  
Expenses, related parties 1.2  
Cash flow, related party 13.3  
Revenue generated by the dealer agreement from related parties 234.6  
Commission expenses, generated from dealer agreement with related parties $ 49.4