Fair Value Measurements (Tables)

9 Months Ended

Jun. 30, 2011

Fair Value, Assets Measured on Recurring Basis

The following table represents financial assets that we measured at fair value on a recurring basis at June 30, 2011 and September 30, 2010, respectively:

June 30, 2011	Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Fair Value as of June 30, 2011
Assets:
Cash equivalents (1)	$	85,285	$	—	$	85,285
U.S. corporate debt (2)		—		21,996		21,996
U.S. government obligations (2)		—		95,597		95,597
Marketable securities (3)		4,846		—		4,846
Total	$	90,131	$	117,593	$	207,724
September 30, 2010	Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Fair Value as of September 30, 2010
Assets:
Cash equivalents (1)	$	82,545	$	—	$	82,545
U.S. corporate debt (2)		—		2,981		2,981
Non U.S. corporate debt (2)		—		17,267		17,267
U.S. government obligations (2)		—		39,452		39,452
U.S. municipal obligations (2)		—		8,915		8,915
Marketable securities (3)		4,367		—		4,367
Total	$	86,912	$	68,615	$	155,527

(1) Included in cash and cash equivalents on our balance sheet at June 30, 2011 and September 30, 2010. Not included in this table are cash deposits of $55.6 million and $63.7 million at June 30, 2011 and September 30, 2010, respectively.

(2) Included in current marketable securities on our balance sheet at June 30, 2011 and September 30, 2010.

(3) Represents securities held under a supplemental retirement and savings plan for certain officers and senior management employees, which are distributed upon termination or retirement of the employees. Included in long-term marketable securities on our balance sheet at June 30, 2011 and September 30, 2010.