Benefit Plans - Weighted Average Assumptions Determining Pension Plan (Detail)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
U.S. Plans
Net Cost
Discount rate	4.15%	4.95%	3.90%
Expected return on plan assets	7.50%	7.75%	7.75%
Rate of compensation increase	4.25%	4.25%	4.25%
Benefit Obligation
Discount rate	4.15%	4.15%	4.95%
Rate of compensation increase	4.25%	4.25%	4.25%
Foreign Plans
Net Cost
Discount rate	3.14%	3.87%	3.94%
Expected return on plan assets	5.45%	5.68%	5.68%
Rate of compensation increase	2.49%	2.46%	3.28%
Benefit Obligation
Discount rate	2.84%	3.14%	3.87%
Rate of compensation increase	2.33%	2.49%	2.46%