Financial Contracts Hedging Commodity and Interest Rate Risk (Detail) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	$ 187.2
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	67.5
Wheat Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	88.0
Soybean Oil Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	20.6
Natural Gas Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	$ 11.1