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Employee Benefit Plan Obligations Estimated amounts to be amortized from AOCI into net periodic benefit cost over the next fiscal year (Details) - USD ($) $ in Millions | Feb. 23, 2018 | Feb. 24, 2017
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Pension Plans, Defined Benefit [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year | $ (0.3) | $ (7.6)
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year | (0.2) | (0.2)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year | 0.1 | 7.4
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year | 3.8 | 3.7
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year | (2.3) | (7.0)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year | $ (6.1) | $ (10.7)

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition 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. + References No definition available. + Details
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