Business Segment, Geographic and Customer Information - Additional Information (Detail)	12 Months Ended
	Aug. 31, 2018 Segment
Segment Reporting Information [Line Items]
Number of reportable segments	2
Largest customer sales in fiscal year, percent	3.00%
Percentage Of Export Sales From Domestic To Total Net Sales	7.00%
Percentage of Product Sales to Consolidated Net Sales	84.00%