Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Infrared Optics	Jun. 30, 2011 Infrared Optics	Jun. 30, 2012 Near-Infrared Optics	Jun. 30, 2011 Near-Infrared Optics	Jun. 30, 2011 Military & Materials	Jun. 30, 2012 Military & Materials	Jun. 30, 2012 Advanced Products Group	Jun. 30, 2011 Advanced Products Group	Jun. 30, 2010 Advanced Products Group
Goodwill [Line Items]
Balance - Beginning of Year	$ 64,262	$ 56,088	$ 10,038	$ 9,525	$ 33,511	$ 32,335	$ 3,914	$ 10,399	$ 10,314	$ 10,314	$ 10,314
Goodwill acquired	16,193	6,485			16,193		6,485
Foreign currency translation	293	1,689	(426)	513	719	1,176
Balance - End of Year	$ 80,748	$ 64,262	$ 9,612	$ 10,038	$ 50,423	$ 33,511	$ 10,399	$ 10,399	$ 10,314	$ 10,314	$ 10,314

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

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+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details