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Weighted-Average Assumption Used to Determine Net Cost (Detail)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	3.51%	3.99%	5.50%
Expected return on plan assets	2.18%	4.68%	8.00%
Rate of compensation increase	1.84%	1.79%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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