Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	May 30, 2020	May 25, 2019	May 26, 2018
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 95,624,000	$ 43,045,000
Deferred payroll taxes	2,900,000
Revenue	703,353,000	728,999,000	$ 654,129,000
Long-term investments	0	0
Unrealized gain (loss) on investments	0	0
Goodwill impairment	0	0	0
Asset impairment charges	$ 649,000
Stock options vesting period	4 years
Right of use asset	$ 34,287,000
Lease liability	41,895,000
Lease liability, noncurrent	30,672,000
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Right of use asset		43,200,000
Lease liability		51,000,000
Lease liability, noncurrent		38,500,000
Reimbursements [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue	$ 9,400,000	$ 12,300,000	$ 11,800,000
Conversion Fees [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue percentage	0.40%	0.50%	0.40%
Permanent Placement Fees [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue percentage	0.60%	0.60%	0.30%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful lives	17 months
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful lives	10 years
Stock Incentive Plan 2014 [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock options vesting period	4 years
Credit Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Credit facility, maximum borrowing capacity	$ 120,000,000
Credit facility, remaining borrowing capacity	$ 30,700,000