Remaining Annual Principal Payments of Credit Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Line Of Credit Facility [Line Items]
Year 1	$ 20,000
Year 2	23,834
Year 3	22,666
Year 4	115,000
Year 5	345,000
Total	526,500
Term Loans
Line Of Credit Facility [Line Items]
Year 1	20,000
Year 2	20,000
Year 3	20,000
Year 4	15,000
Total	75,000	$ 85,000
Yen Line of Credit
Line Of Credit Facility [Line Items]
Year 3	2,666
Total	2,666	2,679
U.S. Dollar Line of Credit
Line Of Credit Facility [Line Items]
Year 4	100,000
Total	100,000	$ 252,000
Note Payable
Line Of Credit Facility [Line Items]
Year 2	3,834
Total	3,834
Convertible Notes
Line Of Credit Facility [Line Items]
Year 5	345,000
Total	$ 345,000