Financial Contracts Hedging Commodity and Interest Rate Risk (Detail) - Cash Flow Hedging	Apr. 23, 2016 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	$ 136,792,000
Wheat Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	115,682,000
Soybean Oil Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	11,605,000
Natural Gas Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of interest rate swap	$ 9,505,000