Stock-Based Compensation (Stock Option Activity) (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2020	May 26, 2019	May 27, 2018
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 21.3	$ 83.5	$ 43.1
Cash received from option exercises	$ 12.4	$ 52.2	$ 32.0
Vesting period (in years)	4 years
Maximum terms of awards (in years)	10 years
Stock options
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock options granted	$ 8.8
Unrecognized compensation cost, period of recognition (in years)	2 years 4 months 24 days
Fair market value on grant date	$ 6.1

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Terms

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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