Revolving Notes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified							3 Months Ended		3 Months Ended					3 Months Ended
	Nov. 30, 2013	Nov. 30, 2013 North American Revolving Credit Facility	Aug. 31, 2013 North American Revolving Credit Facility	Nov. 30, 2013 Mexican Joint Venture Credit Facility	Aug. 31, 2013 Mexican Joint Venture Credit Facility	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit CreditFacility	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit North American Revolving Credit Facility	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit European Credit Facilities	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit European Credit Facilities Minimum	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit European Credit Facilities Maximum	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility Facility	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility First Line of Credit	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility Second Line of Credit	Nov. 30, 2013 Senior Secured Credit Facility Revolving Line Of Credit Mexican Joint Venture Credit Facility Minimum First Line of Credit	Nov. 30, 2013 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						$ 359.8	$ 290.0	$ 19.8			$ 50.0	$ 20.0	$ 30.0
Line of credit maturity date							2016-06		2014-12	2015-06			2015-02	2013-12
LIBOR plus rate							2.25%
Prime plus rate							1.25%
Variable rate above WIBOR rate									1.30%	1.50%
Number of lines of credits											2
Interest on borrowings above LIBOR rate												2.50%	2.00%
Line of credit facility borrowings outstanding due period														2014-01	2014-05
Letter of credit facility outstanding amount	6.2	6.2	6.8
Line of credit facility outstanding amount				$ 38.8	$ 48.2