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Commitments and Contingencies (Details) - USD ($) | Oct. 31, 2019 | Mar. 31, 2019 | Oct. 31, 2018
--- | --- | --- | ---
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Purchase commitments, total |  | $ 262,800,000 |
Affiliated |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Purchase commitments, total |  | $ 95,600,000 |
Bank of America loan and security agreement | Revolving Credit Facility | Bank of America | Standby Letter of Credit |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 3,200,000
Subsequent event | Bank of America loan and security agreement | Revolving Credit Facility | Bank of America | Standby Letter of Credit |  |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |
Credit facility, maximum borrowing capacity | $ 6,400,000.0 |  |

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