Percentage of Net Revenue and Total Accounts Receivable (Detail)	3 Months Ended				6 Months Ended				12 Months Ended
	Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015		Mar. 31, 2016
Sales Revenue, Net
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage					10.00%
Sales Revenue, Net | Governmental - Medicare/Medi-Cal
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage	21.90%		32.70%		22.60%		33.80%
Sales Revenue, Net | L.A Care
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage		[1]	16.00%		11.90%		14.60%
Sales Revenue, Net | Allied Physicians [Member]
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage		[1]		[1]	11.30%			[1]
Sales Revenue, Net | Health Net
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage		[1]	11.30%			[1]	12.40%
Accounts Receivable | Governmental - Medicare/Medi-Cal
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage					29.00%				39.30%
Accounts Receivable | Allied Physicians [Member]
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage					0.00%	[1]			15.80%

[1] Represents less than 10%