DEFERRED DRYDOCK COSTS (Balance Sheet Details) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012	Mar. 31, 2011
Deferred Drydock Costs [Abstract]
Deferred expenditures	$ 17,669	$ 22,573
Accumulated amortization	7,054	12,694
Deferred drydock costs, net	$ 10,615	$ 9,879	$ 6,523