Fair Value of Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2013

Fair Value of Financial Instruments

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

	March 31, 2013
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	115,214	$	—	$	—	$	115,214
Current derivative assets	—		2,827		—		2,827
Noncurrent derivative assets	—		5,303		—		5,303
Total assets measured at fair value	$	115,214	$	8,130	$	—	$	123,344
Liabilities
Current derivative liabilities	$	—	$	6,809	$	—	$	6,809
Noncurrent derivative liabilities	—		7,170		—		7,170
Contingent consideration to Seller of NEK	—		—		11,684		11,684
Total liabilities measured at fair value	$	—	$	13,979	$	11,684	$	25,663

	September 30, 2012
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	171,300	$	—	$	—	$	171,300
Current derivative assets	—		3,779		—		3,779
Noncurrent derivative assets	—		3,713		—		3,713
Total assets measured at fair value	$	171,300	$	7,492	$	—	$	178,792
Liabilities
Current derivative liabilities	$	—	$	6,839	$	—	$	6,839
Noncurrent derivative liabilities	—		6,498		—		6,498
Total liabilities measured at fair value	$	—	$	13,337	$	—	$	13,337