Trade Accounts Receivable Securitization and Sale Programs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			9 Months Ended	3 Months Ended
	May 31, 2011 North American Asset-Backed Securitization Program	May 31, 2011 North American Asset-Backed Securitization Program	May 31, 2012 North American Asset-Backed Securitization Program	May 31, 2011 Foreign Asset-Backed Securitization Program	May 31, 2012 Foreign Asset-Backed Securitization Program	May 31, 2012 Asset-Backed Securitization Programs	May 31, 2011 Asset-Backed Securitization Programs	May 31, 2012 Asset-Backed Securitization Programs	May 31, 2011 Asset-Backed Securitization Programs	May 31, 2012 Trade Accounts Receivable Factoring Agreement	May 31, 2011 Trade Accounts Receivable Factoring Agreement	May 31, 2012 Trade Accounts Receivable Factoring Agreement	May 31, 2011 Trade Accounts Receivable Factoring Agreement	May 31, 2012 Trade Accounts Receivable Sale Programs	May 31, 2011 Trade Accounts Receivable Sale Programs	May 31, 2012 Trade Accounts Receivable Sale Programs	May 31, 2011 Trade Accounts Receivable Sale Programs	May 31, 2012 Trade Accounts Receivable Sale Programs 200.0 Million Dollar Trade Accounts Receivable Sale Program Terminated	May 31, 2012 Trade Accounts Receivable Sale Programs 250.0 Million Dollar Trade Accounts Receivable Sale Program	Nov. 30, 2011 Trade Accounts Receivable Sale Programs 50.0 Million Dollar Trade Accounts Receivable Sale Program
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Percentage of trade account receivables sold to conduits by wholly-owned subsidiary								100.00%
Maximum net cash proceeds available at any one time under asset-backed securitization program and sales program			$ 300.0		$ 200.0													$ 200.0	$ 250.0	$ 50.0
Asset-backed securitization program, expiration date					May 15, 2015
Trade accounts receivable sold	1,400.0	4,300.0		352.8		2,100.0		6,200.0		19.2	14.4	62.6	50.6	500.0	697.8	1,600.0	1,800.0
Cash proceeds for securitization of trade accounts receivable	1,100.0	4,000.0		258.9		1,600.0		5,600.0		19.2	14.3	62.6	50.5	500.0	697.3	1,600.0	1,800.0
Deferred purchase price receivable	280.1	280.1		93.9		542.2		542.2
Valuation allowance for account receivable sold						10.1		10.1
Pretax losses on sale of trade accounts receivable	(0.8)	(2.7)		(0.5)		(1.4)		(4.5)
Interest expense incurred for asset-backed securitization programs							$ 0.3		$ 1.4
Minimum number of days notice required to cancel receivable sale agreements																			30 days	30 days
Trade accounts receivable sale agreement expiration date																				Jun. 01, 2015