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Segment Information - Net Income Reconciliation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total profit from reportable segments | $ 41,143 | $ 35,020 | $ 83,425 | $ 74,539
Unallocated amounts: |  |  |  |
Administrative costs | (6,347) | (5,058) | (13,218) | (11,369)
Investment and other income | 1,056 | 596 | 1,272 | 107
Interest expense | (829) | (1,458) | (1,692) | (3,190)
Earnings before income taxes | $ 35,023 | $ 29,100 | $ 69,787 | $ 60,087

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