Investments (Tables)

6 Months Ended

Oct. 26, 2019

Investments

Schedule of investments

Investments consist of the following (in thousands):

	October 26,		April 30,
	2019		2019
Short-term investments:
Held-to-maturity securities:
Municipal securities	$	21,761	$	5,332
U.S. government securities		65,826		63,205
Corporate bonds		74,048		81,950
Total held-to-maturity short-term investments	$	161,635	$	150,487
Long-term investments:
Held-to-maturity securities:
Municipal securities		5,015		—
U.S. government securities		—		7,404
Corporate bonds		2,495		1,982
Certificates of deposit		1,021		—
Total held-to-maturity investments		8,531		9,386
Available-for-sale securities:
Investment in limited partnership fund		4,947		—
Total available-for-sale investments		4,947		—
Total long-term investments	$	13,478	$	9,386

Schedule of activity related to available-for-sale investments recorded in long-term investments

The following table is a summary of the activity related to the available-for-sale investments recorded in long-term investments (in thousands):

	April 30, 2019		Changes in				October 26, 2019
	Carrying		Fair Value		Sales or		Carrying
	Value		Reflected in Net Income		Purchases		Value
Investment in limited partnership	$	—	$	—	$	4,947	$	4,947
Total investments without readily determinable fair values	$	—	$	—	$	4,947	$	4,947

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 October 26, 2019 were as follows (in thousands):

	October 26, 2019
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	26,776	$	—	$	(6)	$	26,770
U.S. government securities		65,826		150		—		65,976
Corporate bonds		76,543		52		(11)		76,584
Certificates of deposit		1,021		1		—		1,022
Total held-to-maturity investments	$	170,166	$	203	$	(17)	$	170,352

The amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the held-to-maturity investments as of April 30, 2019 were as follows (in thousands):

	April 30, 2019
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	5,332	$	2	$	(1)	$	5,333
U.S. government securities		70,609		78		(52)		70,635
Corporate bonds		83,932		20		(5)		83,947
Total held-to-maturity investments	$	159,873	$	100	$	(58)	$	159,915

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, 2019 were as follows (in thousands):

	Cost		Fair Value
Due within one year	$	161,635	$	161,819
Due after one year through five years		8,531		8,533
Total	$	170,166	$	170,352