DEFERRED DRYDOCK COSTS (Changes in Deferred Balances) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012
Deferred Drydock Costs [Roll Forward]
Balance at beginning of period	$ 9,879	$ 6,523	$ 6,523
Drydock costs accrued	2,480		6,535
Amortization of drydock costs	(879)	(739)	(3,048)
Foreign currency translation adjustment	(171)		(131)
Balance at end of period	$ 11,309		$ 9,879