Goodwill And Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Thousands	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Goodwill [Line Items]
Balance - beginning of period	$ 64,262	$ 56,450
Goodwill acquired - Aegis	21,202
Foreign currency translation	369
Balance - end of period	85,833	56,450
Infrared Optics [Member]
Goodwill [Line Items]
Balance - beginning of period	10,038	9,869
Goodwill acquired - Aegis
Foreign currency translation	(204)
Balance - end of period	9,834	9,869
Near-Infrared Optics [Member]
Goodwill [Line Items]
Balance - beginning of period	33,511	32,353
Goodwill acquired - Aegis	21,202
Foreign currency translation	573
Balance - end of period	55,286	32,353
Military And Materials [Member]
Goodwill [Line Items]
Balance - beginning of period	10,399	3,914
Goodwill acquired - Aegis
Foreign currency translation
Balance - end of period	10,399	3,914
Advanced Products Group [Member]
Goodwill [Line Items]
Balance - beginning of period	10,314	10,314
Goodwill acquired - Aegis
Foreign currency translation
Balance - end of period	$ 10,314	$ 10,314