Acquisition Accounting and Tangible and Intangible Assets Acquired (parenthetical) (Detail) (Optical Components Business Units, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Land
Business Acquisition [Line Items]
Land, property, plant and equipment	$ 3,500
Buildings
Business Acquisition [Line Items]
Land, property, plant and equipment	3,900
Machinery, equipment, furniture and fixtures
Business Acquisition [Line Items]
Land, property, plant and equipment	$ 7,000