Redeemable Noncontrolling Interest - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 27, 2014	May 31, 2010
Redeemable Noncontrolling Interest [Line Items]
Anticipated redemption date of the instrument	2016-05
Redemption date of the debt instrument	May 31, 2016
Accretion redemption value	$ 65.1
Shares transferred	28,571,429
Percentage of number of outstanding shares	1.4695%
Shares transferred in connection with initial public offering	71,428,571
initial public offering, cash paid	35.0
Initial public offering Non-interest bearing notes paid	15.0
Initial public offering, cash paid installments	$ 2.5
Class A Units [Member]
Redeemable Noncontrolling Interest [Line Items]
Economic interest of redeemable noncontrolling interest, approximately	70.00%
Class B Units [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest percentage, approximately		30.00%
Continental Cement Company, L.L.C. [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest percentage, approximately	30.00%
Continental Cement Company, L.L.C. [Member] \| Class A Units [Member]
Redeemable Noncontrolling Interest [Line Items]
Number of class units issued	100
Priority return percentage	11.00%
Allowable sharing percentage in distributions and liquidation proceeds	80.00%
Continental Cement Company, L.L.C. [Member] \| Class B Units [Member]
Redeemable Noncontrolling Interest [Line Items]
Number of class units issued		100,000,000

Debt instrument redemption period date.

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Initial Public Offering Cash Paid Installments

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Maximum allowable sharing percentage in distribution and liquidation proceeds to extent priority return is not made in given year.

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Percentage of priority return accruing daily and compounding annually on issuance to unit class holders.

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End date of debt instrument redemption period, in CCYY-MM-DD format.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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The cash outflow for the purchase of amounts due from customers, clients, lessees, borrowers, or others under the terms of its agreements therewith.

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The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

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