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Business and Basis of Presentation (Cash and Cash Equivalents) (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2019 USD ($)
Cash and Cash Equivalents [Line Items] |
Non-cash financing activities | $ 0.6
Sydney, Australia |
Cash and Cash Equivalents [Line Items] |
Percentage of deposits held in one location (as percent) | 37.00%

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