Associate Retirement Plans - Schedule of Benefit Obligations, Pension & Postretirement Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Dec. 28, 2013	Jan. 03, 2015	Mar. 30, 2013
Benefit Obligation
Benefit obligation at end of year	$ 103,400	$ 93,900
Fair value of plan assets
Plan assets at fair value at end of year	105,949	93,718
Components of net amount recognized in financial position:
Noncurrent liabilities	(22,009)	(23,701)
Cash Balance Pension Plan [Member]
Benefit Obligation
Projected Benefit Obligation Beginning of the year	60,202	57,825
Interest cost	1,682	2,225	2,587
Actuarial (gain) loss	(427)	2,579
Benefits paid	(3,632)	(10,188)
Projected Benefit Obligation Ending of the year	57,825	52,441	60,202
Fair value of plan assets
Beginning of year	64,590	66,977
Actual return on plan assets	6,019	2,872
Benefits paid	(3,632)	(10,188)
Plan assets at fair value at end of year	66,977	59,661	64,590
Funded (unfunded) status	9,152	7,220
Components of net amount recognized in financial position:
Noncurrent assets	9,152	7,220
Net asset/(liability)	9,152	7,220
Amounts recognized in accumulated other comprehensive income:
Net unrecognized actuarial loss (gain)	14,568	14,557
Weighted average assumptions at measurement date:
Discount rate	4.35%	3.60%
Expected return on plan assets	5.95%	5.50%
Super Foods Plan [Member]
Benefit Obligation
Projected Benefit Obligation Beginning of the year		44,675
Obligation assumed in merger	44,915
Interest cost	234	1,998
Actuarial (gain) loss	6	3,380
Benefits paid	(480)	(9,460)
Projected Benefit Obligation Ending of the year	44,675	40,593
Fair value of plan assets
Beginning of year		38,972
Assets assumed in merger	38,147
Actual return on plan assets	1,305	2,220
Company contributions		2,325
Benefits paid	(480)	(9,460)
Plan assets at fair value at end of year	38,972	34,057
Funded (unfunded) status	(5,703)	(6,536)
Components of net amount recognized in financial position:
Noncurrent liabilities	(5,703)	(6,536)
Net asset/(liability)	(5,703)	(6,536)
Amounts recognized in accumulated other comprehensive income:
Net unrecognized actuarial loss (gain)	(1,041)	2,015
Weighted average assumptions at measurement date:
Discount rate	4.65%	3.85%
Expected return on plan assets	5.70%	5.50%
SERP [Member]
Benefit Obligation
Projected Benefit Obligation Beginning of the year	877	856
Interest cost	24	35	39
Actuarial (gain) loss	1	101
Benefits paid	(46)	(78)
Projected Benefit Obligation Ending of the year	856	914	877
Fair value of plan assets
Company contributions	46	78
Benefits paid	(46)	(78)
Funded (unfunded) status	(856)	(914)
Components of net amount recognized in financial position:
Current liabilities	(91)	(100)
Noncurrent liabilities	(765)	(814)
Net asset/(liability)	(856)	(914)
Amounts recognized in accumulated other comprehensive income:
Net unrecognized actuarial loss (gain)	337	408
Weighted average assumptions at measurement date:
Discount rate	4.35%	3.60%
SpartanNash Medical Plan [Member]
Benefit Obligation
Benefit obligation at beginning of year	9,982	7,967
Service cost	194	186	194
Interest cost	287	394	404
Plan amendments	(582)
Actuarial (gain) loss	(1,665)	1,593
Benefits paid	(249)	(235)
Benefit obligation at end of year	7,967	9,905	9,982
Fair value of plan assets
Company contributions	249	235
Benefits paid	(249)	(235)
Funded (unfunded) status	(7,967)	(9,905)
Components of net amount recognized in financial position:
Current liabilities	(323)	(319)
Noncurrent liabilities	(7,644)	(9,586)
Net asset/(liability)	(7,967)	(9,905)
Amounts recognized in accumulated other comprehensive income:
Net unrecognized actuarial loss (gain)	981	2,554
Prior service credit	(882)	(724)
Total	$ 99	$ 1,830
Weighted average assumptions at measurement date:
Discount rate	5.05%	4.15%

Defined benefit plan assumptions used calculating benefit obligation expected long term return on plan assets.

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Pension and other postretirement defined benefit plans assets liabilities current and noncurrent.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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-Glossary Accumulated Benefit Obligation

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After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

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Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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The interest rate used to adjust for the time value of money for the plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Glossary Projected Benefit Obligation

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-Glossary Accumulated Postretirement Benefit Obligation

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The amount of increase in the benefit obligation attributed to business combinations.

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The amount of increase in the plan assets attributed to a business combination.

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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-Glossary Current Liabilities

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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