Remaining Annual Principal Payments of Credit Obligations (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Line Of Credit Facility [Line Items]
Year 1	$ 20,000
Year 2	26,479
Year 3	200,000
Year 4	345,000
Total	591,479
Term Loans
Line Of Credit Facility [Line Items]
Year 1	20,000
Year 2	20,000
Year 3	20,000
Total	60,000	$ 65,000
Yen Line of Credit
Line Of Credit Facility [Line Items]
Year 2	2,645
Total	2,645	2,714
U.S. Dollar Line of Credit
Line Of Credit Facility [Line Items]
Year 3	180,000
Total	180,000	$ 80,000
Note Payable
Line Of Credit Facility [Line Items]
Year 2	3,834
Total	3,834
Convertible Notes
Line Of Credit Facility [Line Items]
Year 4	345,000
Total	$ 345,000