Percentage of Net Revenue and Total Accounts Receivable (Detail)		3 Months Ended			6 Months Ended			12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014		Sep. 30, 2015	Sep. 30, 2014		Mar. 31, 2015
Sales Revenue, Net | Medicare/Medi-Cal
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage		32.70%		[1]	33.80%		[1]
Sales Revenue, Net | L.A Care
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage		16.00%		[2]	14.60%		[2]
Sales Revenue, Net | Healthnet
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage		11.30%		[2]	12.40%		[2]
Sales Revenue, Net | Hollywood Presbyterian
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage	[1]
Sales Revenue, Net | California Hospital Medical Center
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage	[1]
Accounts Receivable | Medicare/Medi-Cal
Accounts Receivable And Net Revenue [Line Items]
Concentration Risk, Percentage					30.90%			22.10%

[1] Represents less than 10%

[2] Not a payor during this time period