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Operating Segments (Reconciliation Of Reportable Segments Measure Of Profit Or Loss To Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 10,072 | $ 7,564 | $ 16,307 | $ 25,006 | $ 14,726 | $ 24,547 | $ 25,589 | $ 32,181 | $ 58,949 | $ 97,043 | $ 114,368
Interest income |  |  |  |  |  |  |  |  | 17,885 | 20,897 | 15,292
Interest expense |  |  |  |  |  |  |  |  | (8,941) | (3,484) | (3,423)
Income before income taxes |  |  |  |  |  |  |  |  | 67,893 | 114,456 | 126,237
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 85,690 | 130,799 | 129,774
Corporate/Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | $ (26,741) | $ (33,756) | $ (15,406)

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