Stock-Based Compensation (Tables)

9 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense and Related Tax Benefits Recognized

Stock-based compensation expense recognized, together with the income tax benefits recognized, is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2019		2018		2019		2018
Stock-based compensation related to RSUs included in    indirect costs and selling expense	$	6,304	$	5,794	$	18,351	$	18,183
Income tax benefit recognized for stock-based    compensation expense	$	1,032	$	1,905	$	3,422	$	5,979

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 2019		101,976		—
Fiscal year 2018		185,056		20,116
Fiscal year 2017		193,420		73,065

Summary of Activity Related to RSUs

Activity related to RSUs during the nine months ended March 31, 2019 is as follows:

	RSUs
Unvested at June 30, 2018		663,987
Granted		271,266
Vested		(263,702	)
Forfeited		(28,643	)
Unvested at March 31, 2019		642,908
Weighted-average grant date fair value for RSUs	$	201.31