Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Goodwill [Line Items]
Balance-beginning of period	$ 123,352	$ 80,748
Goodwill acquired	73,093	41,746
Goodwill adjustment	(516)
Foreign currency translation	216	858
Balance-end of period	196,145	123,352
Infrared Optics | Operating Segments
Goodwill [Line Items]
Balance-beginning of period	9,677	9,612
Foreign currency translation	77	65
Balance-end of period	9,754	9,677
Near-Infrared Optics | Operating Segments
Goodwill [Line Items]
Balance-beginning of period	60,269	48,496
Goodwill acquired		10,980
Foreign currency translation	139	793
Balance-end of period	60,408	60,269
Military & Materials | Operating Segments
Goodwill [Line Items]
Balance-beginning of period		12,326
Goodwill acquired		18,386
Balance-end of period	30,712	30,712
Advanced Products Group | Operating Segments
Goodwill [Line Items]
Balance-beginning of period	22,694	10,314
Goodwill acquired		12,381
Goodwill adjustment	(516)
Balance-end of period	22,178	22,694
Active Optical Products | Operating Segments
Goodwill [Line Items]
Goodwill acquired	73,093
Balance-end of period	$ 73,093