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QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Condensed Financial Operating Results (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Quarterly Financial Data [Abstract]                      
Revenue $ 1,495,581 $ 1,465,600 $ 1,395,469 $ 1,363,392 $ 1,373,878 $ 1,264,958 $ 1,181,641 $ 1,165,864 $ 5,720,042 $ 4,986,341 $ 4,467,860
Income from operations 133,676 113,676 110,187 100,157 81,096 94,908 102,263 99,600 457,696 377,867 340,700
Net income $ 93,731 $ 80,577 $ 79,195 $ 67,977 $ 50,030 $ 68,145 $ 68,596 $ 78,833 $ 321,480 $ 265,604 $ 301,171
Basic earnings per share $ 3.74 $ 3.21 $ 3.16 $ 2.73 $ 2.01 $ 2.74 $ 2.76 $ 3.19 $ 12.84 $ 10.70 $ 12.23
Diluted earnings per share $ 3.68 $ 3.16 $ 3.11 $ 2.66 $ 1.96 $ 2.69 $ 2.71 $ 3.10 $ 12.61 $ 10.46 $ 11.93
Weighted-average basic shares outstanding 25,089 25,078 25,065 24,894 24,875 24,866 24,856 24,737 25,031 24,833 24,616
Weighted-average diluted shares outstanding 25,496 25,478 25,435 25,532 25,472 25,348 25,338 25,424 25,485 25,395 25,255