STOCK PLANS AND STOCK-BASED COMPENSATION - Summary of the components of stock-based compensation expense with the income tax benefits realized (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 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