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Basis of Presentation - Summary of Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Apr. 01, 2018
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Accounting Policies [Abstract] |  |
Unbilled accounts receivable | $ 87,085 | $ 79,492
Collections in excess of revenues and deferred revenues | 127,286 | 127,355
Deferred revenues, long-term portion | $ 81,877 | $ 77,831

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