Stock Plans 9 (Details) - $ / shares shares in Millions	3 Months Ended			12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Restricted Stock Awards (RSAs)
Summary of PSUs granted under long-term incentive plans
Shares				2.9	2.8	3.1
Weighted average grant date fair value (in dollars per share)				$ 31.56	$ 30.59	$ 28.97
Restricted Stock Units (RSUs)
Summary of PSUs granted under long-term incentive plans
Shares				1.0	0.9	0.8
Weighted average grant date fair value (in dollars per share)				$ 30.17	$ 28.72	$ 26.99
Fiscal Year 2016 Incentive Plans | 1-year PSUs under Incentive Plans
Summary of PSUs granted under long-term incentive plans
Performance period (in years)	1 year
Fiscal Year 2016 Incentive Plans | 1-year PSUs under Incentive Plans | Restricted Stock Awards (RSAs)
Summary of PSUs granted under long-term incentive plans
Shares	0.6
Weighted average grant date fair value (in dollars per share)	$ 31.53
Fiscal Year 2016 Incentive Plans | 1-year PSUs under Incentive Plans | Restricted Stock Units (RSUs)
Summary of PSUs granted under long-term incentive plans
Shares	0.1
Weighted average grant date fair value (in dollars per share)	$ 30.53
Fiscal Year 2016 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs
Summary of PSUs granted under long-term incentive plans
Performance period (in years)	1 year
Fiscal Year 2016 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs | Restricted Stock Awards (RSAs)
Summary of PSUs granted under long-term incentive plans
Shares	0.3
Weighted average grant date fair value (in dollars per share)	$ 31.53
Fiscal Year 2016 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs | Restricted Stock Units (RSUs)
Summary of PSUs granted under long-term incentive plans
Shares	0.1
Weighted average grant date fair value (in dollars per share)	$ 28.52
Fiscal Year 2015 Incentive Plans | 1-year PSUs under Incentive Plans
Summary of PSUs granted under long-term incentive plans
Performance period (in years)		1 year
Fiscal Year 2015 Incentive Plans | 1-year PSUs under Incentive Plans | Restricted Stock Awards (RSAs)
Summary of PSUs granted under long-term incentive plans
Shares		0.5
Weighted average grant date fair value (in dollars per share)		$ 31.41
Fiscal Year 2015 Incentive Plans | 1-year PSUs under Incentive Plans | Restricted Stock Units (RSUs)
Summary of PSUs granted under long-term incentive plans
Shares		0.1
Weighted average grant date fair value (in dollars per share)		$ 30.42
Fiscal Year 2015 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs
Summary of PSUs granted under long-term incentive plans
Performance period (in years)		1 year
Fiscal Year 2015 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs | Restricted Stock Awards (RSAs)
Summary of PSUs granted under long-term incentive plans
Shares		0.2
Weighted average grant date fair value (in dollars per share)		$ 30.45
Fiscal Year 2015 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs | Restricted Stock Units (RSUs)
Summary of PSUs granted under long-term incentive plans
Shares		0.1
Weighted average grant date fair value (in dollars per share)		$ 27.50
Fiscal Year 2014 Incentive Plans | 1-year PSUs under Incentive Plans
Summary of PSUs granted under long-term incentive plans
Performance period (in years)			1 year
Fiscal Year 2014 Incentive Plans | 1-year PSUs under Incentive Plans | Restricted Stock Awards (RSAs)
Summary of PSUs granted under long-term incentive plans
Shares			0.7
Weighted average grant date fair value (in dollars per share)			$ 29.91
Fiscal Year 2014 Incentive Plans | 1-year PSUs under Incentive Plans | Restricted Stock Units (RSUs)
Summary of PSUs granted under long-term incentive plans
Shares			0.1
Weighted average grant date fair value (in dollars per share)			$ 28.92
Fiscal Year 2014 Incentive Plans | 3-year PSUs under Incentive Plans
Summary of PSUs granted under long-term incentive plans
Performance period (in years)	3 years
Shares	0.3
Weighted average grant date fair value (in dollars per share)	$ 31.53
Fiscal Year 2014 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs
Summary of PSUs granted under long-term incentive plans
Performance period (in years)			1 year
Fiscal Year 2014 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs | Restricted Stock Awards (RSAs)
Summary of PSUs granted under long-term incentive plans
Shares			0.2
Weighted average grant date fair value (in dollars per share)			$ 28.69
Fiscal Year 2014 Incentive Plans | 1-year PSUs under Sales Retention Equity Programs | Restricted Stock Units (RSUs)
Summary of PSUs granted under long-term incentive plans
Shares			0.1
Weighted average grant date fair value (in dollars per share)			$ 25.73
Fiscal Year 2013 Incentive Plans | 3-year PSUs under Incentive Plans
Summary of PSUs granted under long-term incentive plans
Performance period (in years)		3 years
Shares		0.1
Weighted average grant date fair value (in dollars per share)		$ 31.41