Revolving Notes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	May 31, 2013
Line of Credit Facility [Line Items]
Letter of credit facility outstanding amount	$ 6.8
North American Revolving Credit Facility
Line of Credit Facility [Line Items]
Letter of credit facility outstanding amount	6.8
Line of credit facility outstanding amount	43.0
Mexican Joint Venture Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility outstanding amount	50.0
Senior Secured Credit Facility Revolving Line Of Credit
Line of Credit Facility [Line Items]
Number of senior secured credit facilities	3
Line of credit facility maximum capacity	358.5
Senior Secured Credit Facility Revolving Line Of Credit | North American Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility maximum capacity	290.0
Line of credit maturity date	2016-06
LIBOR plus rate	2.25%
Prime plus rate	1.25%
Senior Secured Credit Facility Revolving Line Of Credit | European Credit Facilities
Line of Credit Facility [Line Items]
Line of credit facility maximum capacity	18.5
Senior Secured Credit Facility Revolving Line Of Credit | European Credit Facilities | Minimum
Line of Credit Facility [Line Items]
Line of credit maturity date	2013-12
Variable rate above WIBOR rate	1.30%
Senior Secured Credit Facility Revolving Line Of Credit | European Credit Facilities | Maximum
Line of Credit Facility [Line Items]
Line of credit maturity date	2015-06
Variable rate above WIBOR rate	1.50%
Senior Secured Credit Facility Revolving Line Of Credit | Mexican Joint Venture Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility maximum capacity	50.0
Number of lines of credits	2
Senior Secured Credit Facility Revolving Line Of Credit | Mexican Joint Venture Credit Facility | First Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility maximum capacity	20.0
Interest on borrowings above LIBOR rate	2.50%
Senior Secured Credit Facility Revolving Line Of Credit | Mexican Joint Venture Credit Facility | Second Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility maximum capacity	$ 30.0
Line of credit maturity date	2015-02
Interest on borrowings above LIBOR rate	2.00%
Senior Secured Credit Facility Revolving Line Of Credit | Mexican Joint Venture Credit Facility | Minimum | First Line of Credit
Line of Credit Facility [Line Items]
Line of credit maturity date	2013-12