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Debt - Summary of Interest Costs and Payments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Charged to operations	$ 134,658	$ 84,019	$ 51,263
Capitalized	34,350	37,929	36,436
Total interest costs	169,008	121,948	87,699
Interest paid, net of amounts capitalized	$ 118,842	$ 68,447	$ 58,401

The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.