Revolving Notes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified										12 Months Ended		12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012 North American Revolving Credit Facility	Aug. 31, 2011 North American Revolving Credit Facility	Aug. 31, 2012 European Credit Facilities	Aug. 31, 2011 European Credit Facilities	Aug. 31, 2012 Mexican Joint Venture Credit Facility	Aug. 31, 2011 Mexican Joint Venture Credit Facility	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit CreditFacility	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit North American Revolving Credit Facility	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit European Credit Facilities	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit European Credit Facilities Minimum	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit European Credit Facilities Maximum	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility Facility	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility First Line of Credit	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility Second Line of Credit	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility Minimum First Line of Credit	Aug. 31, 2012 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility Maximum First Line of Credit
Line of Credit Facility [Line Items]
Number of senior secured credit facilities									3
Line of credit facility maximum capacity									$ 365.8	$ 290.0	$ 25.8			$ 50.0	$ 20.0	$ 30.0
Line of Credit maturities										2016-06		2012-12	2013-06			2015-02	2012-10	2013-03
LIBOR plus rate										2.50%
Prime plus rate										1.50%
Variable rate above WIBOR rate												1.20%	1.70%
Line of credits														2
Interest on borrowings above LIBOR rate															2.50%	2.00%
Letter of credit facility outstanding amount	5.6	4.3
Line of credit facility outstanding amount			$ 0	$ 60.0	$ 15.8	$ 15.2	$ 45.0	$ 15.1