Debt and Other Obligations - Schedule of Long-Term Obligations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified		12 Months Ended							12 Months Ended			12 Months Ended			12 Months Ended											12 Months Ended
	Sep. 30, 2013 Revolving Credit Facility Expiry August 2016 [Member]	Sep. 30, 2013 Capital Lease Obligations, Due Through 2031 [Member]	Sep. 30, 2012 Capital Lease Obligations, Due Through 2031 [Member]	Sep. 30, 2012 Variable Rate Debt [Member] Revolving Credit Facility Expiry August 2016 [Member]	Sep. 30, 2013 Variable Rate Debt [Member] Chinese Renminbi Notes, Due Through 2016, 5.40% - 6.77% [Member]	Sep. 30, 2012 Variable Rate Debt [Member] Chinese Renminbi Notes, Due Through 2016, 5.40% - 6.77% [Member]	Sep. 30, 2013 Fixed Rate Debt [Member]	Jul. 31, 2012 Fixed Rate Debt [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] 5% Notes Due 2017 [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] 5% Notes Due 2017 [Member]	Sep. 30, 2009 Fixed Rate Debt [Member] 5% Notes Due 2017 [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] 2.55% Notes Due 2018 [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] 2.55% Notes Due 2018 [Member]	Jul. 31, 2012 Fixed Rate Debt [Member] 2.55% Notes Due 2018 [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] 3.7% Notes Due 2022 [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] 3.7% Notes Due 2022 [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] Notes Due 2019, 7.42% [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] Notes Due 2019, 7.42% [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] Notes Due 2022, 8.346% - 8.47% [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] Notes Due 2022, 8.346% - 8.47% [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] Note Due 2028, 6.57% - 7.28% [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] Note Due 2028, 6.57% - 7.28% [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] Eurobond, Due 2013, 5.25% [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] Eurobond, Due 2013, 5.25% [Member]	Dec. 31, 2003 Fixed Rate Debt [Member] Eurobond, Due 2013, 5.25% [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] Guarantee Of Employee Stock Option Plan Note Due On Two Thousand And Fourteen [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] Guarantee Of Employee Stock Option Plan Note Due On Two Thousand And Fourteen [Member]	Sep. 30, 2013 Fixed Rate Debt [Member] Chinese Renminbi Notes, Due Through 2018, 4.68% - 6.65% [Member]	Sep. 30, 2012 Fixed Rate Debt [Member] Chinese Renminbi Notes, Due Through 2018, 4.68% - 6.65% [Member]
Debt Instrument [Line Items]
Debt instrument due, year					5.40%	5.40%													8.346%	8.346%	6.57%	6.57%						4.68%	4.68%
Debt instrument, face amount				$ 750
Debt instrument due, year	1.304%							3.70%	5.00%	5.00%	5.00%	2.55%	2.55%	2.55%	3.70%	3.70%	7.42%	7.42%						5.25%	5.25%	8.29%	8.29%
Debt instrument interest rate, maximum					6.77%	6.77%													8.47%	8.47%	7.28%	7.28%						6.65%	6.65%
Debt instrument maturity, maximum range		2031	2031		2016	2016
Debt instrument due, year				2016			2022		2017	2017		2018	2018		2022	2022	2019	2019	2022	2022	2028	2028	2013	2013		2014	2014	2018	2018