Retirement Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Dec. 27, 2014
Compensation and Retirement Disclosure [Abstract]
Period during which company is required to purchase shares at fair value after distribution of shares from ESOP	15 months
Distributed shares subject to put option, fair value	$ 462,008	$ 243,992
ESOP, shares cost	2,633,082	2,436,536
Common stock related to ESOP	3,095,090	2,680,528
ESOP shares, fair value	$ 8,985,297	$ 7,811,906

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

Period during which the Company is required to purchase the shares at fair value after distribution of the shares from the ESOP in months.

+ References

No definition available.

+ Details

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- Details

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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=6418621&loc=d3e17540-113929

+ Details

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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.

+ Details

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