Segment Information (Narrative) (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
GameStop Corp [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue by major customer	16.00%	19.00%	17.00%	17.00%
Wal-Mart Stores Inc [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue by major customer	10.00%			10.00%