Short-Term And Long-Term Investments (Tables)

12 Months Ended

Sep. 30, 2014

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 September 30, 2014, by contractual years-to-maturity, are presented below (in thousands):

September 30, 2014	Cost or Amortized Cost		Fair Value
One year or less	$	363,569	$	363,877
Over one year	483,607		482,917
	$	847,176	$	846,794

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 September 30, 2014 (in thousands):

	Less Than 12 Months					12 Months or Greater					Total
September 30, 2014	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Corporate bonds and notes	$	262,771	$	(848	)	$	7,804	$	(10	)	$	270,575	$	(858	)
Municipal bonds and notes	14,649		(10		)	—		—			14,649		(10		)
U.S. government agency securities	89,464		(135		)	26,975		(33		)	116,439		(168		)
International government securities	2,559		(9		)	—		—			2,559		(9		)
Total	$	369,443	$	(1,002	)	$	34,779	$	(43	)	$	404,222	$	(1,045	)

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):

September 30, 2014	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and notes	$	205,490	$	244	$	(36	)	$	205,698
Municipal bonds and notes	43,398		34		(2		)	43,430
U.S. government securities	4,996		10		—			5,006
U.S. government agency securities	109,685		66		(8		)	109,743
	$	363,569	$	354	$	(46	)	$	363,877

September 30, 2013	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and notes	$	125,010	$	210	$	(8	)	$	125,212
Municipal bonds and notes	72,116		58		(10		)	72,164
U.S. government securities	4,998		2		—			5,000
U.S. government agency securities	150,069		15		(10		)	150,074
	$	352,193	$	285	$	(28	)	$	352,450

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):

September 30, 2014	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and notes	$	325,896	$	208	$	(822	)	$	325,282
Municipal bonds and notes	24,559		31		(8		)	24,582
U.S. government securities	7,377		30		—			7,407
U.S. government agency securities	123,207		40		(160		)	123,087
International government securities	2,568		—		(9		)	2,559
	$	483,607	$	309	$	(999	)	$	482,917

September 30, 2013	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and notes	$	260,345	$	363	$	(390	)	$	260,318
Municipal bonds and notes	24,332		44		(5		)	24,371
Auction rate securities	3,300		—		(264		)	3,036
U.S. government securities	14,755		43		—			14,798
U.S. government agency securities	426,616		294		(452		)	426,458
	$	729,348	$	744	$	(1,111	)	$	728,981