Fair Value Measurements (Tables)

9 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Schedule of Financial Assets Measured at Fair Value on a Recurring Basis

The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at June 30, 2013, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets for Identical Securities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at June 30, 2013
Cash equivalents	$	26,263	$	—	$	—	$	26,263
Short-term investments
Available-for-sale securities — corporate bonds and notes	—		155,174		—		155,174
Available-for-sale securities — municipal bonds and notes	—		63,861		—		63,861
Available-for-sale securities — U.S. government securities	—		4,998		—		4,998
Available-for-sale securities — U.S. government agency securities	—		129,012		—		129,012
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		230,509		—		230,509
Available-for-sale securities — municipal bonds and notes	—		29,050		—		29,050
Available-for-sale securities — U.S. government securities	—		12,358		—		12,358
Available-for-sale securities — U.S. government agency securities	—		438,366		—		438,366
Available-for-sale securities — auction rate securities	—		—		4,048		4,048
Total	$	26,263	$	1,063,328	$	4,048	$	1,093,639

The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2012, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets for Identical Securities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at September 30, 2012
Cash equivalents	$	35,658	$	—	$	—	$	35,658
Short-term investments
Available-for-sale securities — certificates of deposit	—		3,533		—		3,533
Available-for-sale securities — corporate bonds and notes	—		193,990		—		193,990
Available-for-sale securities — municipal bonds and notes	—		63,422				63,422
Available-for-sale securities — U.S. government agency securities	—		60,025		—		60,025
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		229,441		—		229,441
Available-for-sale securities — municipal bonds and notes	—		30,307		—		30,307
Available-for-sale securities — U.S. government securities	—		4,995		—		4,995
Available-for-sale securities — U.S. government agency securities	—		393,310		—		393,310
Available-for-sale securities — auction rate securities	—		—		4,750		4,750
Total	$	35,658	$	979,023	$	4,750	$	1,019,431

Schedule of Reconciliation of Items Measured at Fair Value on a Recurring Basis That Used Significant Unobservable Inputs (Level 3)

The following table provides a reconciliation between the beginning and ending balances of items measured at fair value on a recurring basis in the table above that used significant unobservable inputs (Level 3) (in thousands):

	Three months ended June 30,					Nine months ended June 30,
	2013		2012			2013			2012
Balance, beginning of period	$	4,048	$	13,193		$	4,750		$	13,010
Total gains (losses) realized or unrealized:
Included in other comprehensive income	—		914			(102		)	1,097
Settlements	—		(5,000		)	(600		)	(5,000		)
Balance, end of period	$	4,048	$	9,107		$	4,048		$	9,107
Unrealized gains (losses) attributable to assets still held as of end of period	—		914			(102		)	1,097