Retirement Plans (Tables)

12 Months Ended

Dec. 30, 2017

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension and Other Postretirement Benefit Costs

The components of net periodic pension and other postretirement benefit costs for the last three fiscal years were as follows (in thousands):

	Pension Benefits
	2017			2016			2015
Components of net periodic pension costs:
Service cost	$	2,356		$	3,849		$	32,582
Interest cost		39,474			40,459			39,628
Expected return on plan assets		(47,828	)		(48,296	)		(54,881	)
Amortization of prior service cost		138			157			195
Amortization of net loss		3,848			8,255			10,394
Settlements		17,785			4,487			3,358
Curtailment		138			—			—
Special termination benefit		—			—			422
Net periodic pension costs	$	15,911		$	8,911		$	31,698

	Other Postretirement Plans
	2017			2016			2015
Components of net periodic other postretirement     benefit costs:
Service cost	$	35		$	37		$	37
Interest cost		283			296			264
Amortization of prior service cost (credit)		6			6			(62	)
Amortization of net (gain) loss		(148	)		(71	)		14
Net periodic other postretirement benefit costs	$	176		$	268		$	253

Changes in Plan Assets and Benefit Obligations

Changes in plan assets and benefit obligations recorded in accumulated other comprehensive loss for pension and other postretirement benefits for the last three fiscal years were as follows (in thousands):

	Pension Benefits
	2017			2016			2015
Changes recognized in accumulated other    comprehensive loss:
Actuarial gain (loss)	$	523		$	(64,296	)	$	(3,171	)
Curtailment		138			—			73,191
Prior year correction		—			(21,917	)		—
Amortization of prior service cost		138			157			195
Amortization of net loss		3,848			8,255			10,394
Settlements		17,785			4,487			3,358
Net amount recognized	$	22,432		$	(73,314	)	$	83,967
	Other Postretirement Plans
	2017			2016			2015
Changes recognized in accumulated other    comprehensive loss:
Actuarial gain (loss)	$	181		$	(174	)	$	1,035
Prior service cost		—			—			(1,291	)
Amortization of prior service cost (credit)		6			6			(62	)
Amortization of net (gain) loss		(148	)		(71	)		14
Net amount recognized	$	39		$	(239	)	$	(304	)

Funded Status of the Defined Benefit Plans

The funded status of the defined benefit plans for the last three fiscal years was as follows (in thousands):  

	Pension Benefits
	2017			2016			2015
Change in benefit obligation:
Benefit obligation at beginning of period	$	966,234		$	862,886		$	970,469
Service cost		2,356			3,849			32,582
Interest cost		39,474			40,459			39,628
Actuarial loss (gain)		76,111			73,855			(73,282	)
Curtailment		—			—			(73,191	)
Prior year correction		—			21,917			—
Settlements		(87,225	)		(16,002	)		(15,287	)
Special termination benefit		—			—			422
Benefit disbursements		(20,655	)		(20,730	)		(18,455	)
Benefit obligation at end of period		976,295			966,234			862,886
Change in plan assets:
Fair value of plan assets at beginning of period		799,166			742,341			749,166
Return on plan assets		124,462			57,855			(21,572	)
Employer contribution		35,535			35,702			48,489
Settlements		(87,225	)		(16,002	)		(15,287	)
Benefit disbursements		(20,655	)		(20,730	)		(18,455	)
Fair value of plan assets at end of period		851,283			799,166			742,341
Net funded status	$	(125,012	)	$	(167,068	)	$	(120,545	)

	Other Postretirement Plans
	2017			2016			2015
Change in benefit obligation:
Benefit obligation at beginning of period	$	6,952		$	6,974		$	6,789
Service cost		35			37			37
Interest cost		283			296			264
Employee contributions		195			204			209
Actuarial (gain) loss		(181	)		174			(1,035	)
Plan amendment		—			—			1,291
Benefit disbursements		(661	)		(733	)		(581	)
Benefit obligation at end of period		6,623			6,952			6,974
Change in plan assets:
Fair value of plan assets at beginning of period		—			—			—
Employer contribution		466			529			372
Employee contributions		195			204			209
Benefit disbursements		(661	)		(733	)		(581	)
Fair value of plan assets at end of period		—			—			—
Net funded status	$	(6,623	)	$	(6,952	)	$	(6,974	)

	Pension Benefits
	2017			2016			2015
Amounts recognized in the consolidated    balance sheets consist of the following:
Accrued benefit obligation—current	$	(598	)	$	(549	)	$	(546	)
Accrued benefit obligation—noncurrent		(124,414	)		(166,519	)		(119,999	)
Net amount recognized in the consolidated    balance sheets	$	(125,012	)	$	(167,068	)	$	(120,545	)
Amounts recognized in accumulated other    comprehensive loss consist of the following:
Prior service cost	$	5		$	281		$	438
Net loss		198,990			221,146			147,675
Net loss recognized in accumulated other    comprehensive loss	$	198,995		$	221,427		$	148,113
Additional information:
Accumulated benefit obligation	$	973,946		$	963,008		$	854,858

	Other Postretirement Plans
	2017			2016			2015
Amounts recognized in the consolidated    balance sheets consist of the following:
Accrued benefit obligation—current	$	(527	)	$	(576	)	$	(525	)
Accrued benefit obligation—noncurrent		(6,096	)		(6,376	)		(6,449	)
Net amount recognized in the consolidated    balance sheets	$	(6,623	)	$	(6,952	)	$	(6,974	)
Amounts recognized in accumulated other    comprehensive loss consist of the following:
Gain, net of prior service cost	$	864		$	825		$	1,064
Net gain recognized in accumulated other    comprehensive loss	$	864		$	825		$	1,064

	Pension Benefits		Other Postretirement Plans
Amounts expected to be amortized from    accumulated other comprehensive loss in the    next fiscal year:
Net loss (gain)	$	3,383	$	(156	)
Prior service cost		5		6
Net expected to be amortized	$	3,388	$	(150	)

Assumptions to Determine Benefit Obligations at Period-end and Net Pension Costs

Weighted average assumptions used to determine benefit obligations at period-end and net pension costs for the last three fiscal years were as follows: 

	Pension Benefits
	2017			2016			2015
Benefit obligation:
Discount rate		3.70	%		4.25	%		4.64	%
Annual compensation increase		3.60	%		3.60	%		3.60	%
Net cost:
Discount rate		4.25	%		4.64	%		4.25	%
Expected return on plan assets		6.00	%		6.50	%		7.00	%
Annual compensation increase		3.60	%		3.60	%		3.60	%

	Other Postretirement Plans
	2017			2016			2015
Benefit obligation—discount rate		3.70	%		4.25	%		4.40	%
Net cost—discount rate		4.25	%		4.40	%		4.05	%

Assumed Health Care Trend Rates

The assumed healthcare trend rates for the last three fiscal years were as follows: 

	2017			2016			2015
Immediate rate		6.70	%		7.40	%		7.40	%
Ultimate trend rate		4.50	%		4.50	%		4.50	%
Year the rate reaches the ultimate trend rate	2037			2037				2038

Fair Value of Defined Benefit Plans' Assets by Asset Fair Value Hierarchy Level

The following table (in thousands) sets forth the fair value of our defined benefit plans’ assets by asset fair value hierarchy level.

	Asset Fair Value as of December 30, 2017
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	7,898	$	—	$	—	$	7,898
Equities:
Domestic		33,967		—		—		33,967
International		1,099		—		—		1,099
Mutual funds:
Domestic equities		37,163		—		—		37,163
International equities		32,033		—		—		32,033
Long-term debt securities:
Corporate debt securities:
Domestic		—		223,604		—		223,604
International		—		26,360		—		26,360
U.S. government securities		—		154,906		—		154,906
Government agencies securities		—		7,517		—		7,517
Other		—		4,437		—		4,437
	$	112,160	$	416,824	$	—		528,984
Common collective trust funds:
Cash equivalents								10,282
Domestic equities								249,366
International equities								62,651
Total investments measured at net asset value      as a practical expedient								322,299
Total defined benefit plans’ assets							$	851,283

	Asset Fair Value as of December 31, 2016
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	10,073	$	—	$	—	$	10,073
Equities:
Domestic		30,759		—		—		30,759
International		829		—		—		829
Mutual funds:
Domestic equities		37,711		—		—		37,711
International equities		28,975		—		—		28,975
Long-term debt securities:
Corporate debt securities:
Domestic		—		196,743		—		196,743
International		—		20,120		—		20,120
U.S. government securities		—		154,007		—		154,007
Government agencies securities		—		7,548		—		7,548
Other		—		2,545		—		2,545
	$	108,347	$	380,963	$	—		489,310
Common collective trust funds:
Cash equivalents								6,447
Domestic equities								244,152
International equities								59,257
Total investments measured at net asset value      as a practical expedient								309,856
Total defined benefit plans’ assets							$	799,166

Estimated Future Benefit Payments

Estimated future benefit payments, under Company sponsored plans as of December 30, 2017, were as follows (in thousands):

		Pension Benefits		Other Postretirement Plans
	2018	$	53,888	$	536
	2019		46,852		527
	2020		46,232		539
	2021		45,402		514
	2022		45,136		495
Subsequent five years			224,429		2,368

Multiemployer Pension Plans

Pension Fund	EIN/ Plan Number	PPA Zone Status		FIP/RP Status Pending/ Implemented	Surcharge Imposed	Expiration Dates
		2017	2016
Western Conference of Teamsters    Pension Trust Fund	91-6145047/001	Green	Green	N/A	No	3/31/18 to 3/31/20
Minneapolis Food Distributing    Industry Pension Plan	41-6047047/001	Green	Green	Implemented	No	4/1/21
Teamster Pension Trust Fund of    Philadelphia and Vicinity	23-1511735/001	Yellow	Yellow	Implemented	No	2/10/18(1)
Local 703 I.B. of T. Grocery and    Food Employees’ Pension Plan	36-6491473/001	Green	Green	N/A	No	6/30/18
United Teamsters Trust Fund A	13-5660513/001	Yellow	Yellow	Implemented	No	5/30/19
Warehouse Employees Local    169 and Employers Joint    Pension Fund(2)	23-6230368/001	Red	Red	Implemented	No	2/10/18(1)
Local 705 I.B. of T. Pension    Trust Fund	36-6492502/001	Yellow	Red	Implemented	No	12/29/18

(1) The collective bargaining agreement for this pension fund is operating under an extension through March 2018.

(2) Local 169 filed a Notice of Critical and Declining Status in 2017.

The following table provides information about the Company’s contributions to its multiemployer pension plans. For plans that are not individually significant to the Company, the total amount of USF contributions is aggregated. Prior year contribution amounts have been reclassified to other funds (below) for plans no longer considered significant in 2017.

							USF Contributions
							Exceed 5% of
	USF Contribution(1)(2)						Total Plan Contributions(3)
	(in thousands)
	2017		2016		2015		2016		2015
Pension Fund
Western Conference of Teamsters Pension Trust Fund	$	10,780	$	10,104	$	10,227	No		No
Minneapolis Food Distributing Industry Pension Plan		5,399		5,162		5,200	Yes		Yes
Teamster Pension Trust Fund of Philadelphia and Vicinity		3,917		3,442		3,461	No		No
Local 703 I.B. of T. Grocery and Food Employees’ Pension Plan		1,482		1,258		1,366	Yes		Yes
United Teamsters Trust Fund A		1,741		1,668		1,554	Yes		Yes
Warehouse Employees Local 169 and Employers Joint Pension Fund		846		900		897	Yes		Yes
Local 705 I.B. of T. Pension Trust Fund		3,122		2,923		2,729	No		No
Other Funds		6,853		7,179		8,196		—		—
	$	34,140	$	32,636	$	33,630

(1) Contributions made to these plans during the Company’s fiscal year, which may not coincide with the plans’ fiscal years.

(2) Contributions do not include payments related to multiemployer pension withdrawals/settlements.

(3) Indicates whether the Company was listed in the respective multiemployer plan Form 5500 for the applicable plan year as having made more than 5% of total contributions to the plan. 

Contributions to Multiemployer Pension Plans

The following table provides information about the Company’s contributions to its multiemployer pension plans. For plans that are not individually significant to the Company, the total amount of USF contributions is aggregated. Prior year contribution amounts have been reclassified to other funds (below) for plans no longer considered significant in 2017.

							USF Contributions
							Exceed 5% of
	USF Contribution(1)(2)						Total Plan Contributions(3)
	(in thousands)
	2017		2016		2015		2016		2015
Pension Fund
Western Conference of Teamsters Pension Trust Fund	$	10,780	$	10,104	$	10,227	No		No
Minneapolis Food Distributing Industry Pension Plan		5,399		5,162		5,200	Yes		Yes
Teamster Pension Trust Fund of Philadelphia and Vicinity		3,917		3,442		3,461	No		No
Local 703 I.B. of T. Grocery and Food Employees’ Pension Plan		1,482		1,258		1,366	Yes		Yes
United Teamsters Trust Fund A		1,741		1,668		1,554	Yes		Yes
Warehouse Employees Local 169 and Employers Joint Pension Fund		846		900		897	Yes		Yes
Local 705 I.B. of T. Pension Trust Fund		3,122		2,923		2,729	No		No
Other Funds		6,853		7,179		8,196		—		—
	$	34,140	$	32,636	$	33,630

(1) Contributions made to these plans during the Company’s fiscal year, which may not coincide with the plans’ fiscal years.

(2) Contributions do not include payments related to multiemployer pension withdrawals/settlements.

(3) Indicates whether the Company was listed in the respective multiemployer plan Form 5500 for the applicable plan year as having made more than 5% of total contributions to the plan.