Debt (Details 2) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Summary of interest costs and payment
Charged to operations	$ 84,019	$ 51,263	$ 40,389
Capitalized	37,929	36,436	29,360
Total interest costs	121,948	87,699	69,749
Interest paid, net of amounts capitalized	$ 68,447	$ 58,401	$ 25,544