1. DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Sources of patient service revenues	$ 139,371	$ 93,702	$ 230,963	$ 183,364
MedicareMember
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Sources of patient service revenues	11,830	15,146	26,592	30,597
MedicaidMember
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Sources of patient service revenues	52,916	12,447	61,701	24,167
ManagedCareMember
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Sources of patient service revenues	52,730	50,185	104,430	99,240
IndemnitySelfPayAndOtherMember
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Sources of patient service revenues	21,015	15,209	36,515	27,806
MiscellaneousMember
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Sources of patient service revenues	880	715	1,725	1,554
TotalMember
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Sources of patient service revenues	$ 139,371	$ 93,702	$ 183,364	$ 230,963