Income Taxes (Narrative) (Detail) - USD ($)	6 Months Ended	9 Months Ended
	Dec. 31, 2017	Mar. 31, 2018
Income Taxes [Line Items]
Liability for Uncertain Tax Positions, Noncurrent		$ 29,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Increase (Decrease) in Deferred Income Taxes		$ 286,000
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount		208,000
Unrecognized Tax Benefits		$ 212,000
Tax Year 2018 [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		27.55%