LETTERS OF CREDIT (Details) (USD $)	Sep. 30, 2014	Mar. 31, 2014
Credit facilities
Long-term restricted cash and investment, as determined by the expiration date of the underlying letters of credit	$ 716,000	$ 313,000
Standby letters of credit
Credit facilities
Outstanding Amount	26,512,000
Restricted cash and investment balance	14,190,000
Long-term restricted cash and investment, as determined by the expiration date of the underlying letters of credit	$ 716,000
Standby letters of credit | Minimum
Credit facilities
Percentage of outstanding amount that is cash secured	52.00%
Standby letters of credit | Maximum
Credit facilities
Percentage of outstanding amount that is cash secured	100.00%