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Share-Based Compensation (Tables)
 12 Months Ended
Jan. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of allocation of stock-based compensation
The following table summarizes pre-tax share-based compensation included in the Statements of Income for fiscal years 2018, 2017 and 2016: 
 
Fiscal Year Ended
(in thousands)
January 28, 2018
 
January 29, 2017
 
January 31, 2016
Revenue offset (Warrant)
$
16,219

 
$
5,396

 
$
—

Cost of sales
1,477

 
1,591

 
1,555

Selling, general and administrative
22,423

 
18,019

 
10,055

Product development and engineering
7,817

 
5,822

 
8,858

Share-based compensation
$
47,936

 
$
30,828

 
$
20,468

Net change in share-based compensation capitalized into inventory
$
(414
)
 
$
38

 
$
(98
)
Summary of fair value assumptions
The following table summarizes the assumptions used in the Black-Scholes model to determine the fair value of stock options granted in fiscal years 2018, 2017 and 2016:
 
Fiscal Year Ended
 
January 28, 2018
 
January 29, 2017
 
January 31, 2016
Expected lives, in years
4.2
 
4.1 - 4.5
 
4.2 - 4.3
Estimated volatility
31.7%
 
31% - 32%
 
29% - 32%
Dividend yield
—
 
—
 
—
Risk-free interest rate
1.68%
 
1.04% - 1.51%
 
1.24% - 1.49%
Weighted average fair value on grant date
$10.70
 
$5.71
 
$6.08
Summary of the activity for stock option awards
The following table summarizes the activity for stock options for fiscal years 2018:
(in thousands, except for per share amounts)
Number
of
Shares
 
Weighted
Average
Exercise
Price
(per share)
 
Aggregate
Intrinsic
Value (1)
 
Number of
Shares
Exercisable
 
Weighted
Average
Contractual
Term (years)
Balance at January 29, 2017
1,511

 
24.79

 
13,503

 
759
 
 
Options granted
135

 
37.70

 
 
 
 
 
 
Options exercised
(275
)
 
24.27

 
3,446

 
 
 
 
Options cancelled/forfeited
(26
)
 
26.22

 
 
 
 
 
 
Balance at January 28, 2018
1,345

 
$
26.17

 
$
13,953

 
807
 
 
Exercisable at January 29, 2018
807

 
$
26.61

 
$
7,941

 
 
 
2.1
Vested and expected to vest after January 29, 2018
1,345

 
$
26.17

 
$
13,953

 
 
 
3.0
Summary of unvested stock option awards
The following table summarizes information regarding unvested stock option awards at January 28, 2018:
(in thousands, except for per share amounts)
Number
of
Shares
 
Weighted Average
Exercise Price
(per share)
 
Weighted Average
Grant Date
Fair Value
(per share)
Balance at January 29, 2017
749

 
22.66

  
6.29

Options granted
135

 
37.70

  
10.70

Options vested
(324
)
 
23.92

  
6.71

Options forfeited
(26
)
 
26.23

  
7.32

Balance at January 28, 2018
534

 
$
25.50

  
$
7.10
Summary of the activity for performance unit awards
The following table summarizes the activity for performance-based restricted stock units for fiscal years 2018 and 2017:
 
 
 
Subject to
Share Settlement
 
Subject to
Cash Settlement
 
Weighted 
Average
Grant Date
(in thousands, except for per share amounts)
Total
Units
 
Units
 
Units
 
Recorded
Liability
 
Fair Value
(per share)
Balance at January 29, 2017
383

 
195

 
188

 
$
1,677

 
22.31

Performance units granted
216

 
216

 
—

 
 
 
39.55

Performance units vested
(42
)
 
(42
)
 
—

 
—

 
38.01

Performance units cancelled/forfeited
(194
)
 
(114
)
 
(80
)
 
 
 
30.07

Change in liability
 
 
—

 
 
 
4,791

 
 
Balance at January 28, 2018
363

 
255

 
108

 
$
6,468

 
$
26.58
Summary of fair value assumptions - performance unit awards
The following tables summarize the assumptions used in the Monte Carlo simulation model to determine the fair value of restricted stock units granted in fiscal year 2015 for both Tranche 1 and Tranche 2.
 
January 25, 2015
 
Tranche 1
 
Tranche 2
Expected life, in years
1.6
 
2.1
Estimated volatility
34%
 
34%
Dividend yield
—%
 
—%
Risk-free interest rate
1.5%
 
1.5%
Weighted average fair value on grant date
$17.26
 
$14.88
Summary of activity for market performance units
The following table summarizes the activity for the market performance restricted stock units for the fiscal year ended January 28, 2018:
(in thousands, except for per share amounts)
Total Units
 
Weighted Average
Grant Date
Fair Value
(per unit)
Balance at January 29, 2017
220

 
$
15.59

Market performance units granted
—

 
—

Market performance units vested
(66
)
 
17.26

Market performance units cancelled/forfeited
—

 
—

Balance at January 28, 2018
154

 
$
14.88
Summary of stock unit grants
The Company grants restricted stock units to employees which are expected to be settled with shares of the Company's common stock. The grant date for these awards is equal to the measurement date. These awards are valued as of the measurement date and recognized as an expense over the requisite vesting period (typically 4 years).
(in thousands, except for per share amounts)
Restricted Stock Units, Stock Grants, and Stock Units
 
Performance Shares (1)
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Units granted
983

 
1,228

 
1,032

  
216

 
231

 
235

Weighted-average grant date fair value
36.96

 
22.12

 
20.79

  
39.55

 
17.51

 
28.60

(1) Restricted stock units granted includes awards that will be cash settled of 0 units in fiscal year 2018, 115,500 units in fiscal year 2017, and 90,500 units in fiscal year 2016.
Summary of the status of non-vested restricted stock unit awards and changes during the year
The following table is a summary of the status of non-vested restricted stock unit awards as of January 28, 2018 and changes during the year.
 
Restricted Stock Units, Stock Grants, and Stock Units
Performance Shares 
(in thousands, except for per share amounts)
Shares
 
Weighted Average
Grant Date
Fair Value
(per unit)
 
Shares
 
Weighted Average
Grant Date
Fair Value
(per unit)
Nonvested at January 29, 2017
2,141

 
$
22.54

 
383

 
$
22.31

Granted
983

 
$
36.96

 
216

 
$
39.55

Vested
(792
)
 
$
23.41

 
(42
)
 
$
38.01

Forfeited
(157
)
 
$
27.03

 
(194
)
 
$
30.07

Nonvested at January 28, 2018
2,175

 
$
28.42

 
363

 
$
26.58