Retirement Plans (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Compensation And Retirement Disclosure [Abstract]
Provision for defined contribution plans	$ 1,794	$ 1,957	$ 1,849
Accrued pension liability	883	853
Net periodic pension costs, principally of interest cost and service cost	$ 30	$ 28	$ 53
Actuarial present value of benefit obligations, assumed weighted average discount rate	2.00%	1.90%	1.60%
Actuarial present value of benefit obligations, assumed compensation increase rate	0.00%	0.00%	0.00%
Liability under the deferred compensation plans, total	$ 3,551	$ 3,046
Liability under deferred compensation plan included in long-term liabilities	3,337	3,028
Liability under deferred compensation plan included in accrued expenses	214	18
Deferred compensation plan assets	$ 3,087	$ 2,693

No definition available.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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No definition available.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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