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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Stock-Based Compensation (Restricted Stock And RSU 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]
Vesting period (in years)	4 years
Restricted Stock Units And RSU
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock options granted	$ 9.4
Unrecognized compensation cost, period of recognition (in years)	1 year 7 months 6 days
Fair market value on grant date	$ 4.6	$ 2.3	$ 2.9
Minimum \| Restricted Stock Units And RSU
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Maximum \| Restricted Stock Units And RSU
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years