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Nature of Operations and Summary of Significant Accounting Policies Revenue Table (Details) - USD ($) $ in Thousands | 6 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Revenue, Remaining Performance Obligation, Amount | $ 1,374,000 |
Deferred Revenue, Revenue Recognized | $ 40,360 | $ 36,768
Expected recognition within the next year [Member] |  |
Revenue, Remaining Performance Obligation, Percentage | 36.00% |
Expected recognition beyond the next year [Member] [Member] |  |
Revenue, Remaining Performance Obligation, Percentage | 55.00% |

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