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Long-term Debt - Aggregate Maturities of Long-Term Debt (Detail 3) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Long Term Debt [Abstract]    
2020 $ 46,920  
2021 46,920  
2022 82,109  
2023 93,839  
2024 1,498,416  
Principal amount of long-term debt 1,768,204 $ 1,073,394
Less unamortized discounts and debt issuance costs (10,644) (11,054)
Total long-term debt $ 1,757,560 $ 1,062,340