Unaudited Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Reserve for returns and allowances on accounts receivable	$ 76,142	$ 103,418
Provision for doubtful accounts on accounts receivable	$ 5,575	$ 4,494
Common stock, no par value
Authorized common shares	500,000,000	500,000,000
Common stock, shares issued	137,860,591	135,882,899