Employee Benefit Plans - Assumptions Used to Determine Pension Benefit Obligations (Detail)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	4.50%	3.50%
Initial health care cost trend rate		3.00%	3.50%
Discount rate	4.50%	3.50%	4.50%
Expected long-term rate of return on plan assets	7.80%	7.80%	7.80%
Initial health care cost trend rate	3.00%	3.50%	3.80%
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.00%	3.80%	3.60%
Initial health care cost trend rate	2.80%	3.10%	3.10%
Discount rate	3.80%	3.60%	4.80%
Expected long-term rate of return on plan assets	5.30%	5.30%	5.30%
Initial health care cost trend rate	3.10%	3.10%	3.20%
U. S. Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.80%	4.00%	3.30%
Initial health care cost trend rate	7.00%	7.50%	8.00%
Discount rate	4.00%	3.30%	4.50%
Initial health care cost trend rate	7.50%	8.00%	8.50%
Foreign Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	4.40%	3.90%
Initial health care cost trend rate	7.10%	7.50%	7.40%
Discount rate	4.40%	3.90%	4.90%
Initial health care cost trend rate	7.50%	7.40%	7.90%