Business and Credit Concentrations (Narrative) (Detail)	3 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Concentration Risk [Line Items]
Percentage Of Single Significant Customer Balance To Total Accounts Receivables	20.00%		22.00%
Percentage Of Another Significant Customer Balance To Total Accounts Receivable	12.00%		11.00%
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	11.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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