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Income Taxes - Operating Loss carryforward (Details) - USD ($) $ in Millions	May 30, 2021	May 31, 2020
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 229.2	$ 214.2
Operating loss carryforwards valuation allowance	171.1
Pillsbury acquisition losses
Operating Loss Carryforwards [Line Items]
Valuation allowance	107.9
State and foreign loss carryforwards
Operating Loss Carryforwards [Line Items]
Valuation allowance	29.1
Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	67.3
Other
Operating Loss Carryforwards [Line Items]
Valuation allowance	24.9
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards valuation allowance	162.9
Foreign [Member] | State and foreign loss carryforwards
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards valuation allowance	162.9
Foreign [Member] | Do not expire | State and foreign loss carryforwards
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards valuation allowance	140.0
Foreign [Member] | Expire in fiscal 2022 and 2023 | State and foreign loss carryforwards
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards valuation allowance	2.2
Foreign [Member] | Expire in fiscal 2024 and beyond | State and foreign loss carryforwards
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards valuation allowance	20.7
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards valuation allowance	$ 8.2

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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+ References

No definition available.

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- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Topic 740
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