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Revenue Recognition (Revenue Reconciliation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total revenues | $ 241,414 | $ 270,615 | $ 734,751 | $ 785,214
Cost of sales | 102,179 | 122,941 | 317,421 | 349,966
Total operating expenses | 61,694 | 63,784 | 196,378 | 196,678
Income before income taxes | 50,996 | 57,639 | 140,975 | 159,648
Provision (benefit) for income taxes | 12,829 | (257,154) | 37,501 | (219,609)
Net income | 38,167 | $ 314,793 | 103,474 | $ 379,257
Impact of Change | New Revenue Standard Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total revenues | 13,618 |  | (8,492) |
Cost of sales | 5,140 |  | (3,256) |
Total operating expenses | 391 |  | (188) |
Income before income taxes | 8,087 |  | (5,048) |
Provision (benefit) for income taxes | 2,038 |  | (1,714) |
Net income | 6,049 |  | (3,334) |
Without Adoption of ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total revenues | 255,032 |  | 726,259 |
Cost of sales | 107,319 |  | 314,165 |
Total operating expenses | 62,085 |  | 196,190 |
Income before income taxes | 59,083 |  | 135,927 |
Provision (benefit) for income taxes | 14,867 |  | 35,787 |
Net income | $ 44,216 |  | $ 100,140 |

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