Stock-Based Compensation Incentive Plans (Details) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, awards outstanding	6,207
2007 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, maximum shares authorized	13,900
Incentive plan, shares granted	11,281
Incentive plan, shares cancelled	4,679
Incentive plan, shares vested	1,184
incentive plan, shares available for future awards	7,298
Incentive plan, awards outstanding	5,419
Other Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, awards outstanding	788