Investments (Tables)

3 Months Ended

Jul. 29, 2017

Investments

Schedule of investments

Investments consist of the following (in thousands):

	July 29,		April 30,
	2017		2017
Short-term investments:
Held-to-maturity securities:
Municipal securities	$	37,164	$	47,437
U.S. government securities		16,104		14,515
Corporate bonds		52,063		55,519
Certificates of deposit		2,500		2,500
Total held-to-maturity and short-term investments	$	107,831	$	119,971
Long-term investments:
Held-to-maturity securities:
Municipal securities	$	4,751	$	8,942
U.S. government securities		29,040		22,540
Corporate bonds		—		8,117
Total held-to-maturity investments		33,791		39,599
Available-for-sale securities:
Auction rate securities		2,053		2,497
Total available-for-sale investments		2,053		2,497
Total long-term investments	$	35,844	$	42,096

Held-to-maturity securities

Investments

Schedule of amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of 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 July 29, 2017 were as follows (in thousands):

	July 29, 2017
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	41,915	$	32	$	(6)	$	41,941
U.S. government securities		45,144		2		(48)		45,098
Corporate bonds		52,063		4		(66)		52,001
Certificates of deposit		2,500		1		—		2,501
Total held-to-maturity investments	$	141,622	$	39	$	(120)	$	141,541

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the held-to-maturity investments as of April 30, 2017 were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	56,379	$	30	$	(21)	$	56,388
U.S. government securities		37,055		2		(41)		37,016
Corporate bonds		63,636		9		(85)		63,560
Certificates of deposit		2,500		1		—		2,501
Total held-to-maturity investments	$	159,570	$	42	$	(147)	$	159,465

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 July 29, 2017 were as follows (in thousands):

	Cost		Fair Value
Due within one year	$	107,831	$	107,768
Due after one year through five years		33,791		33,773
Total	$	141,622	$	141,541

Available-for-sale securities | Auction rate securities

Investments

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

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the auction rate securities as of July 29, 2017, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Auction rate securities	$	2,250	$	—	$	(197)	$	2,053
Total available-for-sale investments	$	2,250	$	—	$	(197)	$	2,053

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the auction rate securities as of April 30, 2017, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Auction rate securities	$	2,700	$	—	$	(203)	$	2,497
Total available-for-sale investments	$	2,700	$	—	$	(203)	$	2,497

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 July 29, 2017, were as follows (in thousands):

	Cost		Fair Value
Due after one through five years	$	250	$	251
Due after 10 years		2,000		1,802
Total	$	2,250	$	2,053