Income Taxes (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Income Tax [Line Items]
US corporate income tax rate	21.00%	35.00%
Tax Cuts and Jobs Act, net tax expense (benefit)			$ 12,720
Income tax expense due to remeasurement of deferred tax assets			3,342
Tax Cuts and Jobs Act one-time transition tax expense			7,012
Valuation allowance against net U.S.deferred tax assets	$ 71,350		71,350
Local tax authorities
Income Tax [Line Items]
Deferred tax liabilities, undistributed foreign earnings	$ 2,366		$ 2,366