Net Loss Per Share (Calculation Of Total Incremental Shares Excluded From Diluted Net Loss Per Common Share) (Details) In Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Total incremental shares excluded from Diluted Net Loss Per Common Share	12,540	15,887	12,859	19,667
Conversion of Notes [Member]
Total incremental shares excluded from Diluted Net Loss Per Common Share	12,055	15,406	12,443	18,587
Share Purchase Options [Member]
Total incremental shares excluded from Diluted Net Loss Per Common Share	10	0	6	6
Restricted Share Units [Member]
Total incremental shares excluded from Diluted Net Loss Per Common Share	475	481	410	1,074