Investments (Tables)

12 Months Ended

Nov. 30, 2011

Investments [Abstract]

Summary Of Marketable Securities Classified As Available-For-Sale

	Purchased/ Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Aggregate Fair Value
As of November 30, 2011:
Money market funds	$	16,664	$	—	$	—		$	16,664
Term deposits		560		—		—			560
Mortgage-backed securities		200		51		(26	)		225
	$	17,424	$	51	$	(26	)	$	17,449
As of November 30, 2010:
Money market funds	$	37,016	$	—	$	—		$	37,016
Term deposits		8,707		—		—			8,707
Mortgage-backed securities		201		—		(10	)		191
	$	45,924	$	—	$	(10	)	$	45,914

Summary Of Contractual Maturities Of Fixed Income Securities Included In Short-Term Investments

	November 30,
	2011		2010
Contractual maturities:
Less than one year	$	—	$	1,313
One to three years		225		191
	$	225	$	1,504