Goodwill - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2013		May 31, 2013
Goodwill [Line Items]
Pre tax impairment charge	$ 76,900	[1]	$ 76,900	[1],[2]
Wheels Repair And Parts
Goodwill [Line Items]
Pre tax impairment charge			$ 76,900	[2]

[1] Relates to the Wheels, Repair & Parts segment.

[2] Goodwill impairment relates to the non-cash goodwill impairment charge recognized as part of the Company's annual goodwill impairment analysis as further discussed below.