Summary of Significant Accounting Policies - Estimated Useful Lives (Detail)	12 Months Ended
	Aug. 31, 2018
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment useful life	35 years
Building and improvements | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment useful life	10 years
Building and improvements | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment useful life	25 years
Machinery and Equipment | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment useful life	3 years
Machinery and Equipment | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment useful life	15 years
Other | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment useful life	3 years
Other | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment useful life	7 years