Note 9 Employee Equity Incentive Plans (Stock Options by Exercise Price Range) (Details) (USD $)					12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2013 Range of Exercise Price $5.01 to $7.75 [Member]	Mar. 31, 2013 Range of Exercise Price $7.76 to $10.00 [Member]	Mar. 31, 2013 Range of Exercise Price $10.01 to $12.50 [Member]	Mar. 31, 2013 Range of Exercise Price $12.51 to $99.99 [Member]	Mar. 31, 2013 Range of Exercise Price $5.01 to $99.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	5,327,473	5,472,004	5,199,768	5,188,273	1,205,735	1,582,000	1,611,950	927,788	5,327,473
Weighted Average Contractual Life					5 years 2 months 12 days	5 years 9 months 18 days	6 years 1 month 6 days	4 years 9 months 18 days	5 years 7 months 6 days
Weighted Average Exercise Price Per Share (Options Outstanding)	$ 10.04	$ 9.75	$ 9.03	$ 9.32	$ 6.63	$ 9.21	$ 11.32	$ 13.65	$ 10.04
Number of Shares Exercisable					1,205,735	1,044,500	1,121,450	693,788	4,065,473
Weighted Average Exercise Price Per Share (Options Exercisable)					$ 6.63	$ 9.06	$ 11.11	$ 13.97	$ 9.74

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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