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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accumulated Balances for Each Component of Other Comprehensive Income (Loss), Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2020 | May 26, 2019 | May 27, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gains on available-for-sale securities reclassified to retained earnings | $ 0.0 | $ 0.0 | $ 0.8
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gains on available-for-sale securities reclassified to retained earnings |  |  | 0.8
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gains on available-for-sale securities reclassified to retained earnings |  | (0.6) |
ASU 2016-01 | Retained earnings |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gains on available-for-sale securities reclassified to retained earnings |  | $ 0.6 |
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stranded tax effects from change in tax rate |  |  | (17.4)
ASU 2018-02 | Retained earnings |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stranded tax effects from change in tax rate |  |  | $ 17.4

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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL116659650-108580 + Details
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