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ACQUISITIONS (Detail Textual 2) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,170,086 | $ 1,124,100 | $ 1,087,860 | $ 1,085,814 | $ 1,137,389 | $ 1,086,418 | $ 1,057,530 | $ 1,073,280 |  | $ 4,467,860 | $ 4,354,617 | $ 3,744,053
Net income | $ 51,831 | $ 64,499 | $ 142,795 | $ 42,046 | $ 44,231 | $ 40,357 | $ 42,420 | $ 36,663 |  | 301,171 | 163,671 | 142,799
Amortization expense |  |  |  |  |  |  |  |  |  | $ 38,200 | $ 40,700 | 38,000
NSS Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 427,200 |  |  |
Net income |  |  |  |  |  |  |  |  | 18,800 |  |  |
Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  | $ 7,300
Integration and restructuring costs |  |  |  |  |  |  |  |  | 3,900 |  |  |
NSS Acquisition | Customer contracts and related customer relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  | $ 4,200 |  |  |
[1] | Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.

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