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Equity Method Investments and Related-Party Transactions - Schedule of Related Party Transactions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Euro Infrastructure Co [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue | $ 1,620 | $ 1,945 | $ 4,798 | $ 7,574 |
Expense | 5,664 | 1,725 | 10,254 | 5,313 |
Cash received | 4,048 | 2,191 | 10,102 | 6,540 |
Cash paid | 6,585 | $ 1,407 | 10,677 | $ 5,416 |
Accounts receivable |  |  |  |  | $ 3,307
Collections in excess of revenues and deferred revenues | 7,438 |  | 7,438 |  | 3,246
Ducommun Inc. [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cash paid | 8,209 |  | 15,188 |  |
Accounts payable | $ 4,287 |  | $ 4,287 |  | $ 2,073

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