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Revenue Recognition (Revenue Reconciliation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total revenues | $ 239,357 | $ 258,026 | $ 493,337 | $ 514,599
Cost of sales | 101,885 | 113,928 | 215,242 | 227,025
Total operating expenses | 66,548 | 68,373 | 134,684 | 132,894
Income before income taxes | 43,519 | 49,321 | 89,979 | 102,009
Provision for income taxes | 12,678 | 18,616 | 24,672 | 37,545
Net income | 30,841 | $ 30,705 | 65,307 | $ 64,464
Impact of Change | New Revenue Standard Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total revenues | (16,165) |  | (22,110) |
Cost of sales | (6,204) |  | (8,396) |
Total operating expenses | (440) |  | (579) |
Income before income taxes | (9,521) |  | (13,135) |
Provision for income taxes | (2,771) |  | (3,752) |
Net income | (6,750) |  | (9,383) |
Without Adoption of ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total revenues | 223,192 |  | 471,227 |
Cost of sales | 95,681 |  | 206,846 |
Total operating expenses | 66,108 |  | 134,105 |
Income before income taxes | 33,998 |  | 76,844 |
Provision for income taxes | 9,907 |  | 20,920 |
Net income | $ 24,091 |  | $ 55,924 |

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