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RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS - Impact of Adoption of ASC 606 on Financial Statements - Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,373,878 | $ 1,264,958 | $ 1,181,641 | $ 1,165,864 | $ 1,170,086 | $ 1,124,100 | $ 1,087,860 | $ 1,085,814 | $ 4,986,341 | $ 4,467,860 | $ 4,354,617
Costs of revenue: |  |  |  |  |  |  |  |  |  |  |
Direct costs |  |  |  |  |  |  |  |  | 3,304,053 | 2,978,608 | 2,934,804
Indirect costs and selling expenses |  |  |  |  |  |  |  |  | 1,218,544 | 1,076,356 | 1,050,792
Depreciation and amortization |  |  |  |  |  |  |  |  | 85,877 | 72,196 | 71,760
Total costs of revenue |  |  |  |  |  |  |  |  | 4,608,474 | 4,127,160 | 4,057,356
Income from operations | 81,096 | 94,908 | 102,263 | 99,600 | 80,340 | 104,794 | 88,262 | 67,304 | 377,867 | 340,700 | 297,261
Interest expense and other, net |  |  |  |  |  |  |  |  | 49,958 | 42,036 | 48,642
Income before taxes |  |  |  |  |  |  |  |  | 327,909 | 298,664 | 248,619
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 62,305 | (2,507) | 84,948
Net income | $ 50,030 | $ 68,145 | $ 68,596 | $ 78,833 | $ 51,831 | $ 64,499 | $ 142,795 | $ 42,046 | $ 265,604 | $ 301,171 | $ 163,671
Basic earnings per share | $ 2.01 | $ 2.74 | $ 2.76 | $ 3.19 | $ 2.10 | $ 2.62 | $ 5.80 | $ 1.72 | $ 10.70 | $ 12.23 | $ 6.71
Diluted earnings per share | $ 1.96 | $ 2.69 | $ 2.71 | $ 3.10 | $ 2.05 | $ 2.56 | $ 5.66 | $ 1.67 | $ 10.46 | $ 11.93 | $ 6.53
Under ASC 605 |  |  |  |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 4,975,846 |  |
Costs of revenue: |  |  |  |  |  |  |  |  |  |  |
Direct costs |  |  |  |  |  |  |  |  | 3,304,053 |  |
Indirect costs and selling expenses |  |  |  |  |  |  |  |  | 1,220,317 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 85,877 |  |
Total costs of revenue |  |  |  |  |  |  |  |  | 4,610,247 |  |
Income from operations |  |  |  |  |  |  |  |  | 365,599 |  |
Interest expense and other, net |  |  |  |  |  |  |  |  | 49,958 |  |
Income before taxes |  |  |  |  |  |  |  |  | 315,641 |  |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 59,179 |  |
Net income |  |  |  |  |  |  |  |  | $ 256,462 |  |
Basic earnings per share |  |  |  |  |  |  |  |  | $ 10.33 |  |
Diluted earnings per share |  |  |  |  |  |  |  |  | $ 10.10 |  |
ASU 2014-09 | Effect of ASC 606 |  |  |  |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 10,495 |  |
Costs of revenue: |  |  |  |  |  |  |  |  |  |  |
Indirect costs and selling expenses |  |  |  |  |  |  |  |  | (1,773) |  |
Total costs of revenue |  |  |  |  |  |  |  |  | (1,773) |  |
Income from operations |  |  |  |  |  |  |  |  | 12,268 |  |
Income before taxes |  |  |  |  |  |  |  |  | 12,268 |  |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 3,126 |  |
Net income |  |  |  |  |  |  |  |  | $ 9,142 |  |
Basic earnings per share |  |  |  |  |  |  |  |  | $ 0.37 |  |
Diluted earnings per share |  |  |  |  |  |  |  |  | $ 0.36 |  |
[1] | Net income for the second quarter of FY2019 includes a net benefit related to the TCJA. See Note 19.

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