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Business Segment Information - Summarized Financial Information of Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |
Revenue from external customers | $ 1,165,864 | $ 1,085,814
Net income | 78,833 | 42,046
Domestic Operations |  |
Segment Reporting Information [Line Items] |  |
Revenue from external customers | 1,126,523 | 1,050,883
Net income | 75,449 | 38,833
International Operations |  |
Segment Reporting Information [Line Items] |  |
Revenue from external customers | 39,341 | 34,931
Net income | $ 3,384 | $ 3,213

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