DEFERRED DRYDOCK COSTS (Changes in Deferred Balances) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012
Deferred Drydock Costs [Roll Forward]
Balance at beginning of period			$ 9,879	$ 6,523	$ 6,523
Drydock costs accrued			2,406		6,535
Amortization of drydock costs	(873)	(732)	(1,752)	(1,471)	(3,048)
Foreign currency translation adjustment			82		(131)
Balance at end of period	$ 10,615		$ 10,615		$ 9,879