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Percentage of Net Revenue and Total Accounts Receivable (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Sales Revenue, Net | Governmental - Medicare/Medi-Cal          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage 73.00% 21.90% 72.50% 22.60%  
Sales Revenue, Net | L.A Care          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage [1] 0.00% [1] [1] 11.90%  
Sales Revenue, Net | Allied Physicians [Member]          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage [1] 0.00% [1] [1] 11.30%  
Accounts Receivable | Governmental - Medicare/Medi-Cal          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage     24.30%   20.50%
Accounts Receivable | Allied Physicians [Member]          
Accounts Receivable And Net Revenue [Line Items]          
Concentration Risk, Percentage     12.50%   12.80%
[1] Represents less than 10%