The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Intangible Assets, net - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
Intangible Assets, net - Narrative (Details) - USD ($)	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 4,900,000		$ 4,900,000	$ 9,817,000	$ 9,800,000
Impairment of intangible assets		$ 0
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life				10 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life				30 years