Retirement Plans - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Retirement Plans Disclosure [Abstract]
Compensation expense (ESOP)	$ 334,422,000	$ 337,703,000	$ 310,050,000
Distributed shares subject to put option, fair value	425,514,000	427,226,000
ESOP, shares cost	2,642,583,000	2,526,652,000
Common stock related to ESOP	3,068,097,000	2,953,878,000
ESOP shares, fair value	$ 8,356,659,000	$ 9,201,171,000
Maximum contribution percentage of employees' eligible annual compensation	10.00%
Percentage of company match approved for eligible contributions	50.00%	50.00%
Percentage of eligible wages for matching contributions	3.00%	3.00%
Maximum amount match per employee	$ 750	$ 750
Compensation Expense (401(k))	$ 30,899,000	$ 30,775,000	$ 28,475,000

Fair value of distributed ESOP shares subject to put option as of balance sheet date.

No definition available.

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- Definition

The cost of ESOP shares subject to put option as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Maximum Amount Of Matching Contributions Per Employee

+ References

No definition available.

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- Definition

Retirement Plans Disclosure

+ References

No definition available.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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- Definition

Fair value of the shares allocated that are subject to a repurchase obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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- Definition

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

No definition available.

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