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CAPITAL STOCK (Tables)
 12 Months Ended
Mar. 28, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Cost
Compensation cost related to share-based transactions is recognized in the consolidated financial statements based on fair value. The total amount of share-based compensation expense, which is recorded on a straight line basis, is as follows:
(In thousands)
2020
 
2019
 
2018
Selling, general and administrative expenses
$18,022
 
$12,878
 
$9,960
Research and development
1,210

 
2,972

 
2,114

Cost of goods sold
1,222

 
1,338

 
951

 
$20,454
 
$17,188
 
$13,025
Schedule of Summary of Stock Option Activity
A summary of stock option activity for the fiscal year ended March 28, 2020 is as follows:
 
Options
Outstanding
 
Weighted
Average
Exercise Price
per Share
 
Weighted
Average
Remaining
Life (years)
 
Aggregate
Intrinsic
Value
($000’s)
Outstanding at March 30, 2019
1,013,403

 
$
48.55

 
4.48
 
$
40,902

Granted
207,892

 
98.72

 
 
 
 

Exercised
(244,274
)
 
42.21

 
 
 
 

Forfeited/Canceled
(58,033
)
 
66.73

 
 
 
 

Outstanding at March 28, 2020
918,988

 
$
60.43

 
4.30
 
$
37,471

 
 
 
 
 
 
 
 
Exercisable at March 28, 2020
354,968

 
$
40.46

 
3.15
 
$
21,499

 
 
 
 
 
 
 
 
Vested or expected to vest at March 28, 2020
836,674

 
$
57.93

 
3.88
 
$
36,170
Schedule of Assumptions Utilized for Estimating Fair Value of Option Grants

The assumptions utilized for option grants during the periods presented are as follows:
 
2020
 
2019
 
2018
Volatility
28.2
%
 
26.1
%
 
24.2
%
Expected life (years)
4.9

 
4.9

 
4.8

Risk-free interest rate
2.5
%
 
2.8
%
 
1.7
%
Dividend yield
0.0
%
 
0.0
%
 
0.0
%
Grant-date fair value per Option
$
28.25

 
$
26.67

 
$
10.25
Schedule of Assumptions Used, Other than Options
The weighted average rates used to determine the net periodic benefit costs and projected benefit obligations were as follows:
 
2020
 
2019
 
2018
Discount rate
0.82
%
 
0.97
%
 
1.07
%
Rate of increased salary levels
1.74
%
 
1.78
%
 
1.73
%
Expected long-term rate of return on assets
0.31
%
 
0.75
%
 
0.90
%


The fair values of shares purchased under the Employee Stock Purchase Plan are estimated using the Black-Scholes single option-pricing model with the following weighted average assumptions:
 
2020
 
2019
 
2018
Volatility
34.7
%
 
30.0
%
 
22.6
%
Expected life (months)
6

 
6

 
6

Risk-free interest rate
2.0
%
 
2.3
%
 
1.2
%
Dividend Yield
0.0
%
 
0.0
%
 
0.0
%

The weighted-average grant-date fair value of RSUs granted and total fair value of RSUs vested are as follows:
 
2020
 
2019
 
2018
Grant-date fair value per RSU
$
102.32

 
$
94.55

 
$
41.87

Fair value of RSUs vested
$
54.58

 
$
40.04

 
$
33.03


The assumptions used in the Monte Carlo model for PSUs granted during each fiscal year were as follows:
 
2020
 
2019
 
2018
Expected stock price volatility
28.64
%
 
27.07
%
 
26.11
%
Peer group stock price volatility
29.77
%
 
34.98
%
 
34.13
%
Correlation of returns
50.30
%
 
47.57
%
 
49.51
%


The weighted-average grant-date fair value of PSUs granted and total fair value of PSUs vested are as follows:
 
2020
 
2019
 
2017
Grant-date fair value per PSU
$
146.93

 
$
115.64

 
$
46.49

Fair value of PSUs vested
$
34.78

 
$
29.20

 
$
—
Schedule of Summary of Restricted Stock Units Activity
A summary of RSU activity for the fiscal year ended March 28, 2020 is as follows:
 
Shares
 
Weighted
Average
Grant Date Fair Value
Unvested at March 30, 2019
309,222

 
$
57.07

Granted
105,943

 
102.32

Vested
(118,830
)
 
54.58

Forfeited
(28,118
)
 
63.91

Unvested at March 28, 2020
268,217

 
$
75.34
Schedule of Performance Share Unit awards
A summary of PSU activity for the fiscal year ended March 28, 2020 is as follows:
 
Shares
 
Weighted
Average
Grant Date Fair Value
Unvested at March 30, 2019
448,656

 
$
54.22

Granted(1)
262,758

 
146.93

Vested(2)
(389,806
)
 
34.78

Forfeited
(28,497
)
 
75.68

Unvested at March 28, 2020
293,111

 
$
95.17


(1) Includes 172,879 shares issued for awards vested during fiscal 2020 based on achievement of performance metrics.
(2) Includes the vesting of 336,152 shares that were earned for awards granted in fiscal 2017 for various performance periods ending during fiscal 2020, based on actual relative total shareholder return of 200%. Also includes the vesting of 53,654 shares that were earned in connection with the fiscal 2018 and 2017 internal metrics awards granted to the Company's chief executive officer for the performance period ended March 30, 2019 that were certified by the Committee in May 2019 at 144.31% and 80.05%, respectively.