Short-Term and Long-Term Investments (Tables)

9 Months Ended

Jun. 30, 2013

Schedule of Investments [Line Items]

Schedule of Amortized Cost and Fair Value of Fixed Maturities by Contractual Years-To-Maturity

The amortized cost and fair value of fixed maturities at June 30, 2013, by contractual years-to-maturity, are presented below (in thousands):

	Cost or Amortized Cost		Fair Value
One year or less	$	352,749	$	353,045
Over one year	716,516		714,331
	$	1,069,265	$	1,067,376

Schedule of Investments That Have Been in a Continuous Unrealized Loss Position

The following table summarizes investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for more than 12 months as of June 30, 2013 (in thousands):

	Less Than 12 Months					12 Months or Greater					Total
June 30, 2013	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Corporate bonds and notes	$	196,715	$	(952	)	$	7,851	$	(1	)	$	204,566	$	(953	)
Municipal bonds and notes	14,787		(37		)	—		—			14,787		(37		)
Auction rate securities	—		—			4,048		(352		)	4,048		(352		)
U.S. government agency securities	433,541		(1,297		)	3,330		(1		)	436,871		(1,298		)
Total	$	645,043	$	(2,286	)	$	15,229	$	(354	)	$	660,272	$	(2,640	)

Short-Term Investments [Member]

Schedule of Investments [Line Items]

Schedule of Short-Term and Long-Term Investments

Short-term investments consist of the following (in thousands):

June 30, 2013	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and notes	$	154,949	$	274	$	(49	)	$	155,174
Municipal bonds and notes	63,795		71		(5		)	63,861
U.S. government securities	4,997		1		—			4,998
U.S. government agency securities	129,008		29		(25		)	129,012
	$	352,749	$	375	$	(79	)	$	353,045

September 30, 2012	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	3,528	$	5	$	—		$	3,533
Corporate bonds and notes	193,548		482		(40		)	193,990
Municipal bonds and notes	63,371		61		(10		)	63,422
U.S. government agency securities	60,010		15		—			60,025
	$	320,457	$	563	$	(50	)	$	320,970

Long-Term Investments [Member]

Schedule of Investments [Line Items]

Schedule of Short-Term and Long-Term Investments

Long-term investments consist of the following (in thousands):

June 30, 2013	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and notes	$	231,182	$	231	$	(904	)	$	230,509
Municipal bonds and notes	29,049		33		(32		)	29,050
Auction rate securities	4,400		—		(352		)	4,048
U.S. government securities	12,348		10		—			12,358
U.S. government agency securities	439,537		102		(1,273		)	438,366
	$	716,516	$	376	$	(2,561	)	$	714,331

September 30, 2012	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and notes	$	228,438	$	1,063	$	(60	)	$	229,441
Municipal bonds and notes	30,177		138		(8		)	30,307
Auction rate securities	5,000		—		(250		)	4,750
U.S. government securities	4,983		12		—			4,995
U.S. government agency securities	392,959		389		(38		)	393,310
	$	661,557	$	1,602	$	(356	)	$	662,803