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Leases (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Future minimum lease payments under noncancelable operating leases [Abstract]      
2014 $ 24,470,638    
2015 15,931,144    
2016 8,287,772    
2017 2,831,039    
2018 1,177,697    
Thereafter 56,682    
Total future minimum lease payments 52,754,972    
Operating Leases [Abstract]      
Rental expense $ 26,900,000 $ 25,400,000 $ 24,400,000
Minimum [Member]      
Operating Leases [Abstract]      
Lessee, Operating Lease, Term of Contract 3 years    
Maximum [Member]      
Operating Leases [Abstract]      
Lessee, Operating Lease, Term of Contract 5 years