Debt - Summary of Short Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Current portion of long-term debt	$ 202,404	$ 22
Short-term debt	405,142	234,932
Domestic Debt [Member]
Short-term Borrowings	200,000	200,000
Foreign Debt [Member]
Short-term Borrowings	$ 2,738	$ 34,910