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CAPITAL STOCK (Tables)
 12 Months Ended
Mar. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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, was as follows:
(In thousands)
2019
 
2018
 
2017
Selling, general and administrative expenses
$12,878
 
$9,960
 
$6,894
Research and development
2,972

 
2,114

 
1,549

Cost of goods sold
1,338

 
951

 
707

 
$17,188
 
$13,025
 
$9,150
Schedule of Summary of Stock Option Activity
A summary of stock option activity for the fiscal year ended March 30, 2019 is as follows:
 
Options
Outstanding
 
Weighted
Average
Exercise Price
per Share
 
Weighted
Average
Remaining
Life (years)
 
Aggregate
Intrinsic
Value
($000’s)
Outstanding at March 31, 2018
1,197,438

 
$
36.68

 
4.71
 
$
43,685

Granted
209,675

 
94.67

 
 
 
 

Exercised
(290,824
)
 
35.87

 
 
 
 

Forfeited/Canceled
(102,886
)
 
40.01

 
 
 
 

Outstanding at March 30, 2019
1,013,403

 
$
48.55

 
4.48
 
$
40,902

 
 
 
 
 
 
 
 
Exercisable at March 30, 2019
366,857

 
$
36.63

 
3.06
 
$
18,655

 
 
 
 
 
 
 
 
Vested or expected to vest at March 30, 2019
936,291

 
$
47.16

 
4.20
 
$
38,931
Schedule of Assumptions Utilized for Estimating Fair Value of Option Grants
The assumptions utilized for option grants during the periods presented are as follows:
 
2019
 
2018
 
2017
Volatility
26.1
%
 
24.2
%
 
24.0
%
Expected life (years)
4.9

 
4.8

 
4.9

Risk-free interest rate
2.8
%
 
1.7
%
 
1.2
%
Dividend yield
0.0
%
 
0.0
%
 
0.0
%
Grant-date fair value per Option
$
26.67

 
$
10.25

 
$
7.61
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:
 
2019
 
2018
 
2017
Discount rate
0.97
%
 
1.07
%
 
0.76
%
Rate of increased salary levels
1.78
%
 
1.73
%
 
1.43
%
Expected long-term rate of return on assets
0.75
%
 
0.90
%
 
1.10
%
The weighted-average grant-date fair value of RSUs granted and total fair value of RSUs vested are as follows:
 
2019
 
2018
 
2017
Grant-date fair value per RSU
$
94.55

 
$
41.87

 
$
32.61

Fair value of RSUs vested
$
40.04

 
$
33.03

 
$
34.98

The assumptions used in the Monte Carlo model for PSUs granted during each fiscal year were as follows:
 
2019
 
2018
 
2017
Expected stock price volatility
27.07
%
 
26.11
%
 
26.39
%
Peer group stock price volatility
34.98
%
 
34.13
%
 
33.86
%
Correlation of returns
47.57
%
 
49.51
%
 
51.17
%


The weighted-average grant-date fair value of PSUs granted and total fair value of PSUs vested are as follows:
 
2019
 
2018
 
2017
Grant-date fair value per PSU
$
115.64

 
$
46.49

 
$
34.07

Fair value of PSUs vested
$
29.20

 
$
—

 
$
—

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:
 
2019
 
2018
 
2017
Volatility
30.0
%
 
22.6
%
 
31.3
%
Expected life (months)
6

 
6

 
6

Risk-free interest rate
2.3
%
 
1.2
%
 
0.5
%
Dividend Yield
0.0
%
 
0.0
%
 
0.0
%
Schedule of Summary of Restricted Stock Units Activity
A summary of RSU activity for the fiscal year ended March 30, 2019 is as follows:
 
Shares
 
Weighted
Average
Grant Date Fair Value
Unvested at March 31, 2018
417,714

 
$
38.95

Granted
108,611

 
94.55

Vested
(150,583
)
 
40.04

Forfeited
(66,520
)
 
44.15

Unvested at March 30, 2019
309,222

 
$
57.07
Schedule of Performance Share Unit awards
A summary of PSU activity for the fiscal year ended March 30, 2019 is as follows:
 
Shares
 
Weighted
Average
Grant Date Fair Value
Unvested at March 31, 2018
388,107

 
$
39.63

Granted
94,460

 
115.64

Vested(1)
(12,352
)
 
29.20

Forfeited
(21,559
)
 
49.50

Unvested at March 30, 2019(2)(3)
448,656

 
$
54.22


(1) Includes the vesting of 6,176 shares that were earned in connection with awards granted in fiscal 2016 for the three-year performance cycle award period ended September 30, 2018, based on actual relative total shareholder return of 200%.
(2) Includes 48,851 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, disclosed in this table at the target number of 100%. The fiscal 2018 and 2017 awards were certified by the Committee in May 2019 at 144.31% and 80.05%, respectively.
(3) Includes 65,525 shares that were earned for awards granted in fiscal 2017 for the performance period ended March 30, 2019, disclosed in this table at the target number of 100%. Shares earned under this award were certified by the Committee in April 2019 based on the actual relative total shareholder return of 200%.