Retirement Plan - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Compensation and Retirement Disclosure [Abstract]
Distributed shares subject to put option, fair value	$ 441,536	$ 243,992
ESOP, shares cost	2,588,735	2,436,536
Common stock related to ESOP	3,030,271	2,680,528
ESOP shares, fair value	$ 9,507,211	$ 7,811,906

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.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant