Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Aug. 30, 2014	May 31, 2014	Aug. 30, 2014 Corn Commodity [Member] bu	Aug. 30, 2014 Soybean Meal Commodity [Member] T	Aug. 30, 2014 Maximum [Member]
Derivatives, Fair Value [Line Items]
Term of contract					6 months
Derivative, fair value	$ 273	$ 1,255	$ 139	$ 134
Underlying, derivative volume			2,780,000
Underlying, derivative mass				29,200