(5) Marketable Investments

Excess cash balances are invested primarily in short-term, exchange-traded debt instruments. Investments generally consist of non-equity type investments stated at market value.

The following is a summary of investment securities:

	Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
	(Amounts in thousands)
April 27, 2008    Available-for-Sale Securities:    U.S. corporate equity securities	$	301			$	161			$	—			$	462
U.S. corporate debt securities		10,164			185			(88	)		10,261
Foreign corporate debt securities		14,682			—			(318	)		14,364
	$	25,147		$	346		$	(406	)	$	25,087
April 29, 2007    Available-for-Sale Securities:    U.S. corporate equity securities	$	301		$	247		$	—		$	548
U.S. corporate debt securities		10,952			—			—			10,952
Foreign corporate debt securities		12,592			71			(2	)		12,661
	$	23,845		$	318		$	(2	)	$	24,161

By contractual maturity, all marketable debt investments at April 27, 2008 are due in one year or less; as such, all unrealized losses noted above occurred within the past 12 months. Given the short-term maturity of the investment securities and their related investment rating, none of the above securities were deemed to have an other-than-temporary impairment.