Remaining Annual Amounts of Principal Payments of Credit Facility (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015
Line Of Credit Facility [Line Items]
Year 1	$ 20,000
Year 2	20,000
Year 3	120,000
Year 5	2,493
Total debt	162,493	$ 175,957
Term Loans
Line Of Credit Facility [Line Items]
Year 1	20,000
Year 2	20,000
Year 3	20,000
Total debt	60,000	65,000
Yen Line of Credit
Line Of Credit Facility [Line Items]
Year 5	2,493
Total debt	2,493	2,457
U.S. Dollar Line of Credit
Line Of Credit Facility [Line Items]
Year 3	100,000
Total debt	$ 100,000	$ 108,500