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Associate Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 4 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2022 | Oct. 08, 2022 | Oct. 09, 2021 | Apr. 23, 2022 | Oct. 08, 2022 | Oct. 09, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Gain realized related to refund |  |  |  | $ 0.2 |  |
Pension contributions during last plan year |  | $ 2.2 | $ 2.2 |  | $ 9.1 | $ 10.3
Retiree Medical Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit (income) expense |  | 0.8 |  |  | 0.9 |
Defined Benefit Plan Employer Contributions Current Fiscal Year |  | 0.2 |  |  | 0.2 |
Increase (Decrease) in obligations |  |  |  |  | 6.6 |
SpartanNash Retiree Medical Plan Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit (income) expense | $ 0.7 |  |  |  |  |
Payment to retired participants | $ 2.0 |  |  |  |  |
SpartanNash Retiree Medical Plan Plan [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit (income) expense |  | $ 0.7 | $ 0.2 |  | $ 0.2 | $ 0.5

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- Definition Gain realized related to refund + References No definition available. + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in obligation for pension and other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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