Stock-Based Compensation Incentive Plans (Details) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, awards outstanding	7,611
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	14,798
Incentive plan, shares cancelled	6,092
Incentive plan, shares vested	1,525
incentive plan, shares available for future awards	4,880
Incentive plan, awards outstanding	7,180
Other Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, awards outstanding	431