Stock Plans 9 (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	2.7	3.5	3.8
Weighted average grant date fair value (in dollars per share)	$ 27.06	$ 26.21	$ 24.54
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	0.7	0.9	0.7
Weighted average grant date fair value (in dollars per share)	$ 25.45	$ 23.72	$ 24.06
1-Year PSUs for Fiscal Year 2013 Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)	1 year
1-Year PSUs for Fiscal Year 2013 Incentive Plans [Member] | Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	0.4
Weighted average grant date fair value (in dollars per share)	$ 27.11
1-Year PSUs for Fiscal Year 2013 Incentive Plans [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	0.1
Weighted average grant date fair value (in dollars per share)	$ 26.12
1-Year PSUs for Fiscal Year 2012 Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)		1 year
1-Year PSUs for Fiscal Year 2012 Incentive Plans [Member] | Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares		1.2
Weighted average grant date fair value (in dollars per share)		$ 26.39
1-Year PSUs for Fiscal Year 2012 Incentive Plans [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares		0.2
Weighted average grant date fair value (in dollars per share)		$ 25.40
1-Year PSUs for Fiscal Year 2011 Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)			1 year
1-Year PSUs for Fiscal Year 2011 Incentive Plans [Member] | Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares			1.1
Weighted average grant date fair value (in dollars per share)			$ 24.68
1-Year PSUs for Fiscal Year 2011 Incentive Plans [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares			0.1
Weighted average grant date fair value (in dollars per share)			$ 24.48
3-Year PSUs for Fiscal Year 2010 Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)		3 years
Shares		0.2
Weighted average grant date fair value (in dollars per share)		$ 26.39
3-Year PSUs for Fiscal Year 2009 Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)			3 years
Shares			0.2
Weighted average grant date fair value (in dollars per share)			$ 24.68
1-Year PSUs for Fiscal Year 2013 Sales Retention Equity Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)	1 year
1-Year PSUs for Fiscal Year 2013 Sales Retention Equity Programs [Member] | Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	0.2
Weighted average grant date fair value (in dollars per share)	$ 27.11
1-Year PSUs for Fiscal Year 2013 Sales Retention Equity Programs [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	0.1
Weighted average grant date fair value (in dollars per share)	$ 24.13
1-Year PSUs for Fiscal Year 2012 Sales Retention Equity Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)		1 year
1-Year PSUs for Fiscal Year 2012 Sales Retention Equity Programs [Member] | Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares		0.2
Weighted average grant date fair value (in dollars per share)		$ 26.39
1-Year PSUs for Fiscal Year 2012 Sales Retention Equity Programs [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares		0.1
Weighted average grant date fair value (in dollars per share)		$ 23.41
1-Year PSUs for Fiscal Year 2011 Sales Retention Equity Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)			1 year
1-Year PSUs for Fiscal Year 2011 Sales Retention Equity Programs [Member] | Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares			0.3
Weighted average grant date fair value (in dollars per share)			$ 24.68
1-Year PSUs for Fiscal Year 2011 Sales Retention Equity Programs [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares			0.1
Weighted average grant date fair value (in dollars per share)			$ 24.09