Goodwill - Additional Information (Detail)	Jun. 30, 2012
Goodwill [Line Items]
Contingent consideration as percentage of revenue for acquisition	4.00%

Business Acquisition Contingent Consideration Percentage

No definition available.

Name:	ldl_BusinessAcquisitionContingentConsiderationPercentage
Namespace Prefix:	ldl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant