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Equity Method Investments and Related-Party Transactions - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2021 | Apr. 30, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Earnings from equity method investments |  |  | $ (317,000) | $ (256,000) | $ 14,000 |  |
Euro​ Infrastructure​ Co Step Acquisition [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of additional interest in subsidiary acquired |  |  |  |  |  |  | 51.00%
Euro Infrastructure Co [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments, net of transaction costs, to acquire the issued shares in investment | $ 139,500,000 |  |  |  |  |  |
Equity method investment ownership percentage | 49.00% |  |  |  |  |  |
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 |
Earnings from equity method investments |  | $ 0 |  |  |  |  |
Retained earnings of undistributed cumulative earnings in equity interests, net of tax |  |  |  |  |  |  | $ 10,400,000

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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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