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Segment Information - Net Income Reconciliation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total profit from reportable segments | $ 37,753 | $ 37,910 | $ 112,291 | $ 102,075
Unallocated amounts: |  |  |  |
Administrative costs | (6,203) | (7,126) | (17,571) | (17,600)
Investment and other income | 453 | 721 | 560 | (1,030)
Interest expense | (1,375) | (1,838) | (4,565) | (6,119)
Earnings before income taxes | $ 30,628 | $ 29,667 | $ 90,715 | $ 77,326

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