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Summary by Level of Fair Value of Financial Instruments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | ---
Liabilities: |  |  |
Convertible notes fair value | $ 406,203 |  |
Fair Value, Inputs, Level 3 |  |  |
Liabilities: |  |  |
Contingent earnout arrangements | 7,021 | $ 7,429 |
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Foreign currency forward contracts | 387 |  | $ 121
Liabilities: |  |  |
Net put option | 2,024 |  | 2,024
Contingent earnout arrangements | 4,997 |  | 5,405
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |
Assets: |  |  |
Foreign currency forward contracts | 387 |  | 121
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |
Liabilities: |  |  |
Net put option | 2,024 |  | 2,024
Contingent earnout arrangements | $ 4,997 |  | $ 5,405

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