Debt (Summary of Long-term Debt) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Long-term debt including current portion	$ 315,382	$ 317,398
Less current portion	14,482	14,482
Long-term debt, net	300,900	302,916
Convertible Senior Notes, net
Debt Instrument [Line Items]
Long-term debt including current portion	129,457	127,857
Revolving Bank Loans
Debt Instrument [Line Items]
Long-term debt including current portion	62,000	62,000
Term Bank Loans
Debt Instrument [Line Items]
Long-term debt including current portion	121,392	124,959
Mortgage
Debt Instrument [Line Items]
Long-term debt including current portion	$ 2,533	$ 2,582

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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