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Other Intangible Assets - Other Intangible Assets (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Cost $ 8,901,000 $ 8,901,000
Amortization Expense 223,000 437,000
Accumulated Amortization 5,709,000 5,486,000
Cost, Net of Accumulated Amortization $ 3,192,000 $ 3,415,000
Covenants Not to Compete [Member]    
Finite Lived Intangible Assets [Line Items]    
Life 5 years 5 years
Cost $ 775,000 $ 775,000
Amortization Expense 0 0
Accumulated Amortization 775,000 775,000
Cost, Net of Accumulated Amortization 0 0
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Cost 7,922,000 7,922,000
Amortization Expense 216,000 423,000
Accumulated Amortization 4,782,000 4,566,000
Cost, Net of Accumulated Amortization $ 3,140,000 $ 3,356,000
Customer Relationships [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Life 18 years 18 years
Customer Relationships [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Life 20 years 20 years
TPA Licenses [Member]    
Finite Lived Intangible Assets [Line Items]    
Life 15 years 15 years
Cost $ 204,000 $ 204,000
Amortization Expense 7,000 14,000
Accumulated Amortization 152,000 145,000
Cost, Net of Accumulated Amortization $ 52,000 $ 59,000