Business Segment, Geographic and Customer Information - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Aug. 31, 2013 Segment	May 31, 2013 Segment	Aug. 31, 2013 Segment	Aug. 31, 2013 Maximum	Aug. 31, 2012 Maximum	Aug. 31, 2011 Maximum
Segment Reporting Information [Line Items]
Number of reportable segments	3	3	3
Largest customer sales in fiscal year, percent			3.00%	3.00%	3.00%	3.00%
Export sales from domestic operation, as a percentage of total net sales			8.00%	8.00%	8.00%	8.00%