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Fair Value Measurement - Summary of Carrying Amounts, Estimated Fair Values, and Valuation Input Levels of Certain Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | $ 27,302 | $ 27,351
Mutual Funds - Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 19,950 | 19,985
ETFs - Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 7,352 | 7,366
Carrying Amount |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 27,302 | 27,351
Carrying Amount | Mutual Funds - Corporate & Government Debt | Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 19,950 | 19,985
Carrying Amount | ETFs - Corporate & Government Debt | Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 7,352 | 7,366
Fair Value |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 27,302 | 27,351
Fair Value | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 27,302 | 27,351
Fair Value | Mutual Funds - Corporate & Government Debt | Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 19,950 | 19,985
Fair Value | Mutual Funds - Corporate & Government Debt | Level 1 | Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 19,950 | 19,985
Fair Value | ETFs - Corporate & Government Debt | Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | 7,352 | 7,366
Fair Value | ETFs - Corporate & Government Debt | Level 1 | Corporate & Government Debt |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value | $ 7,352 | $ 7,366

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