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Associate Retirement Plans - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Oct. 05, 2019 | Oct. 06, 2018 | Oct. 05, 2019 | Oct. 06, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension contributions during last plan year |  | $ 2,400,000 | $ 2,100,000 | $ 10,600,000 | $ 10,000,000.0
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pre-tax settlement charges | $ 18,200,000 |  |  |  |
Frozen pension plan, termination date |  |  |  | Jul. 31, 2018 |
Settlement and other termination expenses, recognized |  | 9,400,000 |  | $ 1,300,000 |
Standard pension funding carryover |  |  |  | 0 |
Retiree Medical Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Standard pension funding carryover |  |  |  | 300,000 |
Expected Company contribution for remainder of fiscal year |  | 400,000 |  | 400,000 |
SpartanNash Company Pension Plan [Member] | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic benefit (income) expense |  | 10,100,000 | (100,000) | 19,300,000 | (300,000)
SpartanNash Retiree Medical Plan [Member] | Retiree Medical Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic benefit (income) expense |  | $ 100,000 | $ 100,000 | $ 300,000 | $ 400,000

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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