FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Sep. 30, 2011

FAIR VALUE OF FINANCIAL INSTRUMENTS

Summary of assets and liabilities measured and recorded at fair value on Balance Sheet on a recurring basis

	September 30, 2011						September 30, 2010
	Level 1		Level 2		Total		Level 1		Level 2		Total
Assets
Cash equivalents	$	266,842	$	—	$	266,842	$	129,756	$	—	$	129,756
Short-term investments - U.S. government agency securities	—		—		—		—		36,000		36,000
Short-term investments - tax exempt bonds	—		25,829		25,829		—		48,081		48,081
Current derivative assets	—		7,466		7,466		—		11,428		11,428
Total assets	266,842		33,295		300,137		129,756		95,509		225,265
Liabilities
Current derivative liabilities	—		7,522		7,522		—		3,193		3,193
Noncurrent derivative liabilities	—		6,164		6,164		—		4,748		4,748
Net assets	$	266,842	$	19,609	$	286,451	$	129,756	$	87,568	$	217,324