Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended
	Aug. 31, 2014	Aug. 31, 2014 Estimate of Fair Value Measurement [Member]	Apr. 01, 2014 Estimate of Fair Value Measurement [Member]	Dec. 17, 2013 After market services (AMS)	Aug. 31, 2014 After market services (AMS)	Apr. 01, 2014 After market services (AMS) Malaysia
Discontinued Operations [Line Items]
Consideration for the sale of a business				$ 725,000,000
Cash consideration for the sale of a business				675,000,000
Consideration for the sale of a business preferred stock		33,500,000	33,200,000	50,000,000
Accretes dividends at an annual rate				8.00%
Redeemable period				9 years
Reduction in final purchase price				92,300,000
Amount kept in escrow relating to sale of business						20,000,000
Gain on sale of discontinued operations	223,299,000				223,300,000
Direct transaction cost	16,500,000
Income tax expense	$ 7,579,000