CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 1,459,506	$ 1,363,392
Operating costs and expenses:
Costs of revenue	939,934	878,881
Indirect costs and selling expenses	355,004	357,592
Depreciation and amortization	30,144	26,762
Total operating costs and expenses	1,325,082	1,263,235
Income from operations	134,424	100,157
Interest expense and other, net	9,980	16,811
Income before income taxes	124,444	83,346
Income tax expense	30,800	15,369
Net income	$ 93,644	$ 67,977
Basic earnings per share	$ 3.73	$ 2.73
Diluted earnings per share	$ 3.67	$ 2.66
Weighted-average basic shares outstanding	25,099	24,894
Weighted-average diluted shares outstanding	25,486	25,532