Segment Information (Narrative) (Details)	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
GameStop Corp [Member]
Percent of net revenue by major customer	16.00%	16.00%	14.00%
Wal-Mart Stores Inc [Member]
Percent of net revenue by major customer	10.00%	12.00%	14.00%