Significant Accounting Policies (Other) (Details)	12 Months Ended
Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Other comprehensive income/(loss):
Other comprehensive income/(loss)	$ 0	$ 0	$ 0
Foreign currency translation
Number of foreign currency derivative instruments held	0	0	0
Trade receivables (net):
Provision for doubtful accounts	$ 0	$ 0

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Number of foreign currency exchange rate derivatives held by the entity at the reporting date.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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