Computation of Net Loss Per Share (Parenthetical) (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]
Diluted weighted average shares outstanding in the absence of a loss	368.2	365.9	368.6	366.4

Diluted weighted average shares outstanding if the entity had not reported a net loss for the period.

No definition available.

Name:	tlab_WeightedAverageNumberOfDilutedSharesOutstandingInAbsenceOfNetLoss
Namespace Prefix:	tlab_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration