Operating Segment, Geographic Information and Significant Customers - Customers Comprising Ten Percent or More of Revenues (Detail) - Revenues	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Revenue, Major Customer [Line Items]
Concentration risk, percent	0.00%	22.00%	46.00%
Customer Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk, percent	36.00%	43.00%	57.00%
Customer Concentration Risk \| Raytheon Company
Revenue, Major Customer [Line Items]
Concentration risk, percent	20.00%	23.00%	20.00%
Customer Concentration Risk \| Lockheed Martin Corporation
Revenue, Major Customer [Line Items]
Concentration risk, percent	16.00%	20.00%	37.00%

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration