FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Sep. 30, 2012

Fair Value of Financial Instruments

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

The following table presents assets and liabilities measured and recorded at fair value on our balance sheets on a recurring basis (in thousands):

	September 30, 2012						September 30, 2011						September 30, 2010						September 30, 2009
	Level 1		Level 2		Total		Level 1		Level 2		Total		Level 1		Level 2		Total		Level 1		Level 2		Total
Assets
Cash equivalents	$	171,300	$	—	$	171,300	$	266,842	$	—	$	266,842	$	129,756	$	—	$	129,756	$	178,893	$	—	$	178,893
Short-term investments—U.S. government agency securities		—		—		—		—		—		—		—		36,000		36,000		—		8,127		8,127
Short-term investments—tax exempt bonds		—		—		—		—		25,829		25,829		—		48,081		48,081		—		—		—
Current derivative assets		—		3,779		3,779		—		7,466		7,466		—		11,428		11,428		—		18,106		18,106
Non-current derivative assets		—		3,713		3,713		—		—		—		—		—		—		—		—		—
Total assets measured at fair value		171,300		7,492		178,792		266,842		33,295		300,137		129,756		95,509		225,265		178,893		26,233		205,126
Liabilities
Current derivative liabilities		—		6,839		6,839		—		7,522		7,522		—		3,193		3,193		—		17,933		17,933
Non-current derivative liabilities		—		6,498		6,498		—		6,164		6,164		—		4,748		4,748		—		—		—
Total liabilities measured at fair value	$	—	$	13,337	$	13,337	$	—	$	13,686	$	13,686	$	—	$	7,941	$	7,941	$	—	$	17,933	$	17,933

Schedule of estimated fair value and carrying value of long-term debt

The following table presents the estimated fair value and carrying value of our long-term debt (in millions):

	September 30,
	2012		2011		2010		2009
Fair value	$	12.5	$	17.5	$	21.6	$	25.1
Carrying value		11.5		15.9		20.5		25.1