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Associate Retirement Plans - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2022 | Jul. 16, 2022 | Jul. 17, 2021 | Apr. 23, 2022 | Jul. 16, 2022 | Jul. 17, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Gain realized related to refund |  |  |  | $ 200,000 |  |
Pension contributions during last plan year |  | $ 3,100,000 | $ 3,400,000 |  | $ 6,900,000 | $ 8,000,000.0
Retiree Medical Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit (income) expense |  | 100,000 |  |  |  |
Defined Benefit Plan Employer Contributions Current Fiscal Year |  | 200,000 |  |  | 200,000 |
Increase (Decrease) in obligations |  |  |  |  | 6,600,000 |
SpartanNash Retiree Medical Plan Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit (income) expense | $ 700,000 |  |  |  |  |
Payment to retired participants | $ 2,000,000.0 |  |  |  |  |
SpartanNash Retiree Medical Plan Plan [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit (income) expense |  | $ 700,000 | $ 100,000 |  | $ 900 | $ 300,000

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