STOCK PLANS AND STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Jun. 30, 2016

Stock Plans And Stock-Based Compensation [Abstract]

Summary of stock-based compensation expense recognized

	Year ended June 30,
	2016		2015		2014
Stock-based compensation included in indirect costs and    selling expense:
Restricted stock and RSU expense	$	17,919	$	14,072	$	11,516
SSARs and non-qualified stock option expense		—		—		41
Total stock-based compensation expense	$	17,919	$	14,072	$	11,557
Income tax benefit recognized for stock-based compensation    expense	$	6,476	$	5,260	$	4,392

Summary of activity for outstanding SSARs and stock options

	Number of Shares			Exercise Price		Weighted Average Exercise Price		Weighted Average Grant Date Fair Value
Outstanding, June 30, 2013		275,550		$37.67 – 59.30		$	48.62		17.54
Exercisable, June 30, 2013		243,170		37.67 – 59.30			48.58		17.60
Exercised		(180,370	)	45.77 – 49.36			48.53		17.81
Forfeited		(1,150	)		49.36		49.36		17.12
Expired		(2,080	)		49.36		49.36		17.12
Outstanding, June 30, 2014		91,950		37.67 – 59.30			48.77		17.02
Exercisable, June 30, 2014		91,950		37.67 – 59.30			48.77		17.02
Exercised		(44,290	)	37.67 – 59.30			49.36		17.33
Forfeited		—			—		—		—
Expired		(5,000	)		47.59		47.59		10.68
Outstanding, June 30, 2015		42,660		37.67 – 49.36			48.29		17.45
Exercisable, June 30, 2015		42,660		37.67 – 49.36			48.29	$	17.45
Exercised		(35,860	)	37.67 – 49.36			48.18		17.25
Forfeited		—			—		—		—
Expired		(6,800	)		48.83		48.83		18.50
Outstanding, June 30, 2016		—			—		—		—
Exercisable, June 30, 2016		—			—	$	—	$	—

Summary of activity related to SSARs/Non-qualified stock options and RSUs/Restricted shares issued

	SSARs and Stock Options					Restricted Stock and Restricted Stock Units
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value
Unvested at June 30, 2013		32,380		$	17.02		1,042,746		$	47.74
Granted		—			—		254,356			72.17
Vested		(31,230	)		17.02		(360,857	)		45.07
Forfeited		(1,150	)		17.12		(98,003	)		54.94
Unvested at June 30, 2014		—			—		838,242			55.39
Granted		—			—		322,121			76.37
Vested		—			—		(250,613	)		47.84
Forfeited		—			—		(45,184	)		66.89
Unvested at June 30, 2015		—			—		864,566			64.79
Granted		—			—		275,117			80.72
Vested		—			—		(209,448	)		49.48
Forfeited		—			—		(56,381	)		75.79
Unvested at June 30, 2016		—		$	—		873,854		$	71.20

Summary of information regarding cash proceeds received, intrinsic value and total tax benefits realized resulting from stock options exercises

	Year ended June 30,
	2016		2015		2014
Cash proceeds received	$	—	$	872	$	—
Intrinsic value realized	$	1,286	$	1,646	$	3,868
Income tax benefit realized	$	465	$	615	$	1,470

Summary of activity related to MSPP And DSPP

	MSPP
RSUs outstanding, June 30, 2015		5,905
Granted		703
Issued		(5,215	)
Forfeited		—
RSUs outstanding, June 30, 2016		1,393
Weighted average grant date fair value as adjusted for the    applicable discount	$	73.72