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Debt (Summary of Long-term Debt) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Debt Instrument [Line Items]    
Mortgage $ 2,730 $ 2,763
Long-term debt including current portion 331,579 353,666
Less current portion 14,482 14,466
Long-term debt, net 317,097 339,200
Convertible Senior Notes, net    
Debt Instrument [Line Items]    
Long-term debt including current portion 123,189 121,676
Revolving Bank Loans    
Debt Instrument [Line Items]    
Long-term debt including current portion 70,000 90,000
Term Bank Loans    
Debt Instrument [Line Items]    
Long-term debt including current portion $ 135,660 $ 139,227