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Equity Method Investments and Related-Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Foreign currency translation adjustments, net of tax |  | $ 4,418 | $ (1,436) | $ 3,615 | $ (3,720)
Income from equity method investments |  | (317) | 1,154 | 14 | 2,521
Euro Infrastructure Co [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Payments, net of transaction costs, to acquire the issued shares in investment | $ 139,500 |  |  |  |
Equity method investment ownership percentage | 49.00% |  |  |  |
Foreign currency translation adjustments, net of tax |  | 2,900 | 1,700 | $ 1,500 | 1,700
Maximum useful life of intangible assets basis difference, years |  |  |  | 11 years |
Weighted average useful life of intangible assets basis difference, years |  |  |  | 10 years |
Maximum useful life of tangible assets basis difference, years |  |  |  | 11 years |
Weighted average useful life of tangible assets basis difference, years |  |  |  | 11 years |
Income from equity method investments |  |  | $ 1,200 |  | $ 2,500
Retained earnings of undistributed cumulative earnings in equity interests, net of tax |  | $ 10,700 |  | $ 10,700 |

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- Definition Amount of income (loss) for proportionate share of equity method investee's income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 + Details
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- Definition The maximum useful life of the basis difference assigned to finite-lived intangible assets in 'PnYnMdDTnHnMnS' format (the basis difference defined as the difference between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee). + References No definition available. + Details
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