Investments (Tables)

6 Months Ended

Oct. 26, 2013

Investments

Schedule of investments

Investments consist of the following (in thousands):

	October 26,2013		April 30,2013
Short-term investments:
Held-to-maturity securities:
Municipal securities	$	77,677	$	73,241
Total short-term investments	$	77,677	$	73,241
Long-term investments:
Held-to-maturity securities:
Municipal securities	$	38,898	$	54,158
Certificates of deposit	3,891		—
Total held-to-maturity investments	42,789		54,158
Available-for-sale securities:
Auction rate securities	5,467		5,687
Convertible bonds	3,451		9,071
Total available-for-sale investments	8,918		14,758
Total long-term investments	$	51,707	$	68,916

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair value of securities held-to-maturity investments

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the held-to-maturity investments as of October 26, 2013, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
Municipal securities	$	116,575	$	75	$	(11	)	$	116,639
Certificates of deposit	3,891		—		—			3,891
Total held-to-maturity investments	$	120,466	$	75	$	(11	)	$	120,530

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the held-to-maturity investments as of April 30, 2013, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
Municipal securities	$	127,399	$	49	$	(23	)	$	127,425
Total held-to-maturity investments	$	127,399	$	49	$	(23	)	$	127,425

Held-to-maturity securities

Investments

Schedule of amortized cost and fair value by contractual maturity

The amortized cost and fair value of the held-to-maturity securities by contractual maturity at October 26, 2013, were as follows (in thousands):

	Cost		Fair Value
Due within one year	$	77,677	$	77,711
Due after one year through three years	42,789		42,819
Total	$	120,466	$	120,530

Available-for-sale securities | Auction rate securities

Investments

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair value of available-for-sale investments

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the available-for-sale investments as of October 26, 2013, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
Auction rate securities	$	6,575	$	—	$	(1,108	)	$	5,467
Total available-for-sale investments	$	6,575	$	—	$	(1,108	)	$	5,467

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the available-for-sale investments as of April 30, 2013, were as follows (in thousands):

	`			Gross		Gross
		Amortized		Unrealized		Unrealized
		Cost		Gains		Losses			Fair Value
Auction rate securities		$	6,750	$	—	$	(1,063	)	$	5,687
Total available-for-sale investments		$	6,750	$	—	$	(1,063	)	$	5,687

Schedule of amortized cost and fair value by contractual maturity

The amortized cost and fair value of the auction rate securities by contractual maturity at October 26, 2013, were as follows (in thousands):

	Cost		Fair Value
Due after five through 10 years	$	1,300	$	1,203
Due after 10 years	5,275		4,264
Total	$	6,575	$	5,467

Available-for-sale securities | Convertible bonds

Investments

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and estimated fair value of available-for-sale investments

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the available-for-sale convertible bonds as of October 26, 2013, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
Convertible bonds	$	3,037	$	461	$	(47	)	$	3,451
Total available-for-sale investments	$	3,037	$	461	$	(47	)	$	3,451

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the available-for-sale convertible bonds as of April 30, 2013, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses			Fair Value
Convertible bonds	$	3,037	$	6,173	$	(139	)	$	9,071
Total available-for-sale investments	$	3,037	$	6,173	$	(139	)	$	9,071

Schedule of amortized cost and fair value by contractual maturity

The amortized cost and fair value of the convertible bonds by contractual maturity at October 26, 2013, were as follows (in thousands):

	Cost		Fair Value
Due within five years	$	3,037	$	3,451
Total	$	3,037	$	3,451