STOCK PLANS AND STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Components of Stock-Based Compensation Expense and Related Tax Benefits

A summary of the components of stock-based compensation expense recognized during the years ended June 30, 2021, 2020, and 2019, together with the income tax benefits realized, is as follows (in thousands):

	Year Ended June 30,
	2021		2020		2019
Stock-based compensation included in indirect costs and    selling expense:
Restricted stock and RSU expense	$	30,463	$	29,302	$	25,272
Income tax benefit recognized for stock-based compensation	$	8,009	$	5,849	$	4,865

Annual Performance-Based Awards Granted

The annual performance-based awards granted for each of the fiscal years presented were as follows:

	Performance-based stock awards granted		Number of additional shares earned under performance-based stock awards
Fiscal year 2021		111,729		—
Fiscal year 2020		108,844		—
Fiscal year 2019		129,108		12,462

Summary of Activity Related to Restricted Stock and RSUs

Changes in the number of unvested restricted stock and RSUs during each of the years in the three-year period ended June 30, 2021, 2020, and 2019, together with the corresponding weighted-average fair values, are as follows:

	Restricted Stock and Restricted Stock Units
	Number of Shares			Weighted Average Grant Date Fair Value
Unvested at June 30, 2018		663,987		$	107.96
Granted		274,261			201.27
Vested		(276,626	)		61.85
Forfeited		(32,816	)		123.55
Unvested at June 30, 2019		628,806		$	134.10
Granted		271,542			252.25
Vested		(348,897	)		77.33
Forfeited		(49,528	)		181.89
Unvested at June 30, 2020		501,923		$	173.18
Granted		198,564			243.87
Vested		(240,950	)		99.55
Forfeited		(33,566	)		219.94
Unvested at June 30, 2021		425,971		$	209.60

Summary of Activity Related to MSPP

Activity related to the MSPP during the year ended June 30, 2021 is as follows:

	MSPP
RSUs outstanding, June 30, 2020		2,223
Granted		1,409
Issued		(528	)
Forfeited		(11	)
RSUs outstanding, June 30, 2021		3,093
Weighted average grant date fair value as adjusted for the applicable discount	$	185.45