Preliminary Allocation of Purchase Price of Assets Acquired and Liabilities Assumed at Date of Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 MCubed Technologies Incorporated	Nov. 01, 2012 MCubed Technologies Incorporated	Dec. 03, 2012 Thin Film Filter Business And Interleaver Product Line Oclaro Incorporated	Mar. 31, 2013 LightWorks Optics Incorporated	Dec. 21, 2012 LightWorks Optics Incorporated
Assets
Accounts receivable, net		$ 7,424			$ 1,738
Inventories		4,696	1,085		3,785
Prepaid and other assets		518	129		191
Deferred income taxes		21,089
Property, plant & equipment		17,769	6,273		3,079
Intangible assets	49,000	23,400	8,980	49,000	16,600
Goodwill		11,774	10,980		18,486
Total assets acquired		86,670	27,447		43,879
Liabilities
Accounts payable		2,807			724
Deferred income taxes		14,834
Other accrued liabilities		864			9,187
Total liabilities assumed		18,505			9,911
Net assets acquired		$ 68,165			$ 33,968