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Derivative Instruments - Narrative (Details) - Not Designated as Hedging Instrument $ in Thousands, $ in Thousands, R$ in Millions | Apr. 15, 2020 USD ($) | Mar. 31, 2021 USD ($) $ / $ | Mar. 31, 2021 AUD ($) $ / $ | Nov. 20, 2020 BRL (R$) derivativeInstrument educationalInstitution R$ / $ | Nov. 20, 2020 USD ($) derivativeInstrument educationalInstitution R$ / $ | Apr. 08, 2020 USD ($) $ / $ | Apr. 08, 2020 AUD ($) $ / $
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Currency Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Unamortized premium | $ |  |  |  |  | $ 18,294 |  |
Currency Swap | Australia |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount |  | $ 13,713 | $ 21,000 |  |  |  |
Derivative, exchange rate | $ / $ |  | 0.6530 | 0.6530 |  |  |  |
Currency Swap | Brazil, Brazil Real |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of currency derivatives held (derivative instrument) | derivativeInstrument |  |  |  | 6 | 6 |  |
Derivative notional amount |  |  |  | R$ 1,875 | $ 343,783 |  |
Derivative, exchange rate |  |  |  | 5.4540 | 5.4540 |  |
Currency Swap | Brazil, Brazil Real | Put/Call Options |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives held | educationalInstitution |  |  |  | 4 | 4 |  |
Cross Currency Interest Rate Contract, Instrument Three and Four | Brazil, Brazil Real |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | R$ |  |  |  | R$ 1,900 |  |  |
Currency Swap, Deal Contingent | Brazil, Brazil Real |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives held | educationalInstitution |  |  |  | 2 | 2 |  |
Cross Current Interest Rate Contract, Instrument Three | Brazil, Brazil Real |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | R$ |  |  |  | R$ 950 |  |  |
Cross Current Interest Rate Contract, Instrument Three | Brazil, Brazil Real | Minimum |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, exchange rate |  |  |  | 5.484143 | 5.484143 |  |
Cross Current Interest Rate Contract, Instrument Three | Brazil, Brazil Real | Maximum |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, exchange rate |  |  |  | 5.678624 | 5.678624 |  |
Cross Current Interest Rate Contract, Instrument Four | Brazil, Brazil Real |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | R$ |  |  |  | R$ 950 |  |  |
Cross Current Interest Rate Contract, Instrument Four | Brazil, Brazil Real | Minimum |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, exchange rate |  |  |  | 5.44706 | 5.44706 |  |
Cross Current Interest Rate Contract, Instrument Four | Brazil, Brazil Real | Maximum |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, exchange rate |  |  |  | 5.63255 | 5.63255 |  |
Cross currency interest rate contract, Instrument Two | Australia |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  | $ 12,999 | $ 21,000
Derivative, exchange rate | $ / $ |  |  |  |  |  | 0.6190 | 0.6190
Proceeds from sale of derivatives | $ | $ 714 |  |  |  |  |  |

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