Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended					12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013 Food Ingredients [Member]	May 31, 2013 Food Ingredients [Member]	Aug. 31, 2012 Food Ingredients [Member]	Aug. 31, 2011 Maximum [Member]	Aug. 31, 2013 Customer Lists [Member]	Aug. 31, 2013 Non-Compete Agreements [Member]	Aug. 31, 2013 Patents [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 7,978,000	$ 7,978,000	$ 8,000,000		$ 8,000,000
Additions to goodwill	0
Intangible asset residual value									0
Impairment to the recorded value of goodwill				0
Weighted average remaining amortization period (in years)	4 years						2 years	5 years	5 years
Amortization expense related to intangible assets	$ 100,000	$ 100,000				$ 100,000