Investments (Tables)

9 Months Ended

Jan. 28, 2017

Investments

Schedule of investments

Investments consist of the following (in thousands):

	January 28,		April 30,
	2017		2016
Short-term investments:
Held-to-maturity securities:
Municipal securities	$	40,211	$	42,179
U.S. government securities		19,720		21,184
Corporate bonds		56,664		40,041
Certificates of deposit		4,500		—
Total held-to-maturity and short-term investments	$	121,095	$	103,404
Long-term investments:
Held-to-maturity securities:
Municipal securities	$	15,446	$	—
U.S. government securities		15,549		7,518
Corporate bonds		10,336		23,561
Total held-to-maturity investments		41,331		31,079
Available-for-sale securities:
Auction rate securities		2,418		2,780
Total available-for-sale investments		2,418		2,780
Total long-term investments	$	43,749	$	33,859

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 January 28, 2017, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	55,657	$	25	$	(43)	$	55,639
U.S. government securities		35,269		5		(13)		35,261
Corporate bonds		67,000		2		(113)		66,889
Certificates of deposit		4,500		3		—		4,503
Total held-to-maturity investments	$	162,426	$	35	$	(169)	$	162,292

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the held-to-maturity investments as of April 30, 2016, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	42,179	$	5	$	(7)	$	42,177
U.S. government securities		28,702		23		—		28,725
Corporate bonds		63,602		54		(32)		63,624
Certificates of deposit		—		—		—		—
Total held-to-maturity investments	$	134,483	$	82	$	(39)	$	134,526

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 January 28, 2017, were as follows (in thousands):

	Cost		Fair Value
Due within one year	$	121,095	$	121,031
Due after one year through five years		41,331		41,261
Total	$	162,426	$	162,292

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 January 28, 2017, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Auction rate securities	$	2,700	$	—	$	(282)	$	2,418
Total available-for-sale investments	$	2,700	$	—	$	(282)	$	2,418

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the auction rate securities as of April 30, 2016, were as follows (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Auction rate securities	$	3,100	$	—	$	(320)	$	2,780
Total available-for-sale investments	$	3,100	$	—	$	(320)	$	2,780

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 January 28, 2017, were as follows (in thousands):

	Cost		Fair Value
Due after one through five years	$	700	$	677
Due after 10 years		2,000		1,741
Total	$	2,700	$	2,418