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Debt (Summary of Long-term Debt) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Debt Instrument [Line Items]    
Mortgage $ 2,615 $ 2,763
Long-term debt including current portion 319,420 353,666
Less current portion 190,723 [1] 14,466
Long-term debt, net 128,697 [1] 339,200
Convertible Senior Notes, net    
Debt Instrument [Line Items]    
Long-term debt including current portion 126,279 121,676
Revolving Bank Loans    
Debt Instrument [Line Items]    
Long-term debt including current portion 62,000 90,000
Term Bank Loans    
Debt Instrument [Line Items]    
Long-term debt including current portion $ 128,526 $ 139,227
[1] (as restated)