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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
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May 25, 2019 | May 26, 2018 | May 27, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue | $ 728,999,000 | $ 654,129,000 | $ 583,411,000
Goodwill impairment | $ 0 | 0 | 0
Stock options vesting period | 4 years |  |
Other assets | $ 3,180,000 | 2,049,000 |
Accounting Standards Update 2018-15 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other assets | 800,000 |  |
Reimbursements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue | $ 12,300,000 | $ 11,800,000 | $ 10,100,000
Conversion Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue percentage | 0.50% | 0.40% | 0.50%
Permanent Placement Fees [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue percentage | 0.60% | 0.30% | 0.10%
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful lives | 3 years |  |
Stock options vesting period | 1 year |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expected impact of new accounting standard | $ 45,000,000 |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful lives | 10 years |  |
Stock options vesting period | 4 years |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expected impact of new accounting standard | $ 50,000,000 |  |

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