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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Jun. 30, 2018

STOCK-BASED COMPENSATION

Schedule of stock-based compensation expense in the consolidated statements of operations

        We recorded stock-based-compensation expense in the consolidated statement of operations as follows (in thousands):

		2016			2017			2018
Cost of goods sold		$	1,199		$	1,443		$	972
Selling, general and administrative			19,307			21,354			22,293
Research and development			253			433			581
Restructuring			—			2,902			—
​	​	​	​	​	​	​	​	​	​	​
Stock based compensation expense			20,759			26,132			23,846
Less: Related income tax benefit			(7,762	)		(9,815	)		(7,391	)
​	​	​	​	​	​	​	​	​	​	​
Stock based compensation expense, net		$	12,997		$	16,317		$	16,455
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

Schedule of weighted average assumptions used to determine the fair value calculations for stock options issued

		2016			2017			2018
Expected dividend			—			—			—
Risk-free interest rate			1.4	%		1.7	%		1.9	%
Expected volatility			31.0	%		33.0	%		29.0	%
Expected holding period (in years)			4.5			4.5			4.5

Summary of stock option activity

Number of Options

Weighted- Average Exercise Price

Weighted-Average Remaining Contractual Term

Aggregate Intrinsic Value (in thousands)

Outstanding at June 30, 2015

1,012,650

27.30

Granted

35,162

73.42

Exercised

(107,059

)

28.05

Expired or forfeited

(6,641

)

66.56

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Outstanding at June 30, 2016

934,112

28.67

Granted

19,176

73.42

Exercised

(168,564

)

26.68

Expired or forfeited

(4,053

)

68.28

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Outstanding at June 30, 2017

780,671

$

30.00

Granted

25,379

85.83

Exercised

(121,651

)

23.53

Expired or forfeited

(6,874

)

73.77

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Outstanding at June 30, 2018

677,525

$

32.80

2.9 years

$

30,364

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Exercisable at June 30, 2018

635,160

$

29.62

2.5 years

$

30,301

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Summary of restricted stock award and RSU award activity

		Shares			Weighted- Average Fair Value
Nonvested at June 30, 2015			659,906		$	63.75
Granted			337,628			72.90
Vested			(417,896	)		65.36
Forfeited			(49,140	)		67.70
​	​	​	​	​	​	​	​
Nonvested at June 30, 2016			530,498		$	67.94
Granted			379,888			64.55
Vested			(299,277	)		67.87
Net replacement RSUs (1)			20,953			67.76
Forfeited			(20,375	)		68.34
​	​	​	​	​	​	​	​
Nonvested at June 30, 2017			611,687		$	65.85
Granted			351,034			74.09
Vested			(413,639	)		65.33
Forfeited			(22,705	)		70.32
​	​	​	​	​	​	​	​
Nonvested at June 30, 2018			526,377		$	71.56
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

(1)           Pursuant to the acquisition of AS&E, we assumed unvested RSUs originally granted by AS&E and converted them into RSUs for our Common Stock.

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the changes in outstanding nonvested shares.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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