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Business Segment Information - Summarized Financial Information of Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue from external customers | $ 1,181,641 | $ 1,087,860 | $ 2,347,505 | $ 2,173,674
Net income | 68,596 | 142,795 | 147,429 | 184,841
Domestic Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from external customers | 1,142,552 | 1,046,823 | 2,269,075 | 2,097,706
Net income | 64,557 | 138,930 | 140,006 | 177,763
International Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue from external customers | 39,089 | 41,037 | 78,430 | 75,968
Net income | $ 4,039 | $ 3,865 | $ 7,423 | $ 7,078

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