Commitments and Contingencies (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total	Total
Long-term Purchase Commitment [Line Items]
Commitments		$ 33,711
MMBTU Natual Gas Dollar Equivalent [Member]
Long-term Purchase Commitment [Line Items]
Commitments		13,620
Pounds Of Flour Dollar Equivalent [Member]
Long-term Purchase Commitment [Line Items]
Commitments		12,707
Capital Expenditures [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase commitments	$ 5,586	5,586
Dryers [Member]
Long-term Purchase Commitment [Line Items]
Purchases made against commitment	$ 2,054	$ 5,903