Acquisition Accounting and Tangible and Intangible Assets Acquired (Detail) (Optical Components Business Units, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Mar. 29, 2013
Business Acquisition [Line Items]
Cash paid upon closing	$ 14,087
Total purchase consideration	24,258
Other Liability
Business Acquisition [Line Items]
Liabilities assumed	8,844
To be paid in three equal installments | Notes Payable
Business Acquisition [Line Items]
Liabilities assumed	11,130		11,130
Initial Preliminary Allocation
Business Acquisition [Line Items]
Cash paid upon closing	14,087
Net receivable from Lapis	(959)
Liabilities assumed	8,819
Total purchase consideration	24,258
Inventory	13,309
Other current assets	35
Land, property, plant and equipment	14,433	[1]
Fair Value of assets acquired	33,077
Initial Preliminary Allocation | Other Liability
Business Acquisition [Line Items]
Pension and retirement obligations	6,471
Other compensation-related liabilities	1,083
Other current liabilities	1,265
Initial Preliminary Allocation | To be paid in three equal installments | Notes Payable
Business Acquisition [Line Items]
Liabilities assumed	11,130
Initial Preliminary Allocation | Developed Technology
Business Acquisition [Line Items]
Intangible assets acquired	2,120
Initial Preliminary Allocation | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired	$ 3,180

[1] (1) Includes land of $3.5 million, buildings of $3.9 million and machinery, equipment, furniture and fixtures of $7.0 million.