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Associate Retirement Plans (Tables) | 9 Months Ended
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Oct. 10, 2015
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Pension and Postretirement Benefit Costs | The following table provides the components of net periodic pension and postretirement benefit costs for the 12 weeks and 40 weeks ended October 10, 2015 and October 4, 2014:
| October 10, 2015 |  |  | October 4, 2014 |
12 Weeks Ended | SpartanNash |  |  | Combined SpartanNash |  |  | Cash Balance |  |  | Super Foods |
(In thousands) | Pension Plan |  |  | Pension Plan * |  |  | Pension Plan |  |  | Pension Plan |
Interest cost | $ |  | 767 |  |  | $ |  | 1,017 |  |  | $ |  | 556 |  |  | $ |  | 461 |
Expected return on plan assets |  |  | (1,136 | ) |  |  |  | (1,399 | ) |  |  |  | (867 | ) |  |  |  | (532 | )
Recognized actuarial net loss |  |  | 191 |  |  |  |  | 228 |  |  |  |  | 228 |  |  |  |  | — |
Net periodic benefit | $ |  | (178 | ) |  | $ |  | (154 | ) |  | $ |  | (83 | ) |  | $ |  | (71 | )
Settlement expense |  |  | 131 |  |  |  |  | 261 |  |  |  |  | 261 |  |  |  |  | — |
Total (income) expense | $ |  | (47 | ) |  | $ |  | 107 |  |  | $ |  | 178 |  |  | $ |  | (71 | )
12 Weeks Ended | SERP |  |  | Spartan Stores Medical Plan |
(In thousands) | October 10, 2015 |  |  | October 4, 2014 |  |  | October 10, 2015 |  |  | October 4, 2014 |
Service cost | $ |  | — |  |  | $ |  | — |  |  | $ |  | 54 |  |  | $ |  | 44 |
Interest cost |  |  | 8 |  |  |  |  | 8 |  |  |  |  | 93 |  |  |  |  | 91 |
Amortization of prior service cost |  |  | — |  |  |  |  | — |  |  |  |  | (36 | ) |  |  |  | (37 | )
Recognized actuarial net loss |  |  | 10 |  |  |  |  | 7 |  |  |  |  | 40 |  |  |  |  | 4 |
Net periodic expense | $ |  | 18 |  |  | $ |  | 15 |  |  | $ |  | 151 |  |  | $ |  | 102 |
| October 10, 2015 |  |  | October 4, 2014 |
40 Weeks Ended | SpartanNash |  |  | Combined SpartanNash |  |  | Cash Balance |  |  | Super Foods |
(In thousands) | Pension Plan |  |  | Pension Plan * |  |  | Pension Plan |  |  | Pension Plan |
Interest cost | $ |  | 2,558 |  |  | $ |  | 3,390 |  |  | $ |  | 1,854 |  |  | $ |  | 1,536 |
Expected return on plan assets |  |  | (3,787 | ) |  |  |  | (4,664 | ) |  |  |  | (2,891 | ) |  |  |  | (1,773 | )
Recognized actuarial net loss |  |  | 636 |  |  |  |  | 761 |  |  |  |  | 761 |  |  |  |  | - |
Net periodic benefit | $ |  | (593 | ) |  | $ |  | (513 | ) |  | $ |  | (276 | ) |  | $ |  | (237 | )
Settlement expense |  |  | 437 |  |  |  |  | 783 |  |  |  |  | 783 |  |  |  |  | - |
Total (income) expense | $ |  | (156 | ) |  | $ |  | 270 |  |  | $ |  | 507 |  |  | $ |  | (237 | )
| SERP |  |  | Spartan Stores Medical Plan |
40 Weeks Ended |  |  |  |  |  |  |  |  |  |  |
(In thousands) | October 10, 2015 |  |  | October 4, 2014 |  |  | October 10, 2015 |  |  | October 4, 2014 |
Service cost | $ |  | — |  |  | $ |  | — |  |  | $ |  | 178 |  |  | $ |  | 144 |
Interest cost |  |  | 25 |  |  |  |  | 27 |  |  |  |  | 311 |  |  |  |  | 303 |
Amortization of prior service cost |  |  | — |  |  |  |  | — |  |  |  |  | (121 | ) |  |  |  | (122 | )
Recognized actuarial net loss |  |  | 32 |  |  |  |  | 23 |  |  |  |  | 133 |  |  |  |  | 15 |
Net periodic expense | $ |  | 57 |  |  | $ |  | 50 |  |  | $ |  | 501 |  |  | $ |  | 340 |
*The amounts above reflect the combined values of the Cash Balance and Super Foods Pension Plans as of October 4, 2014. |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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