NEW ACCOUNTING PRONOUNCEMENTS (Details)	6 Months Ended
Jun. 30, 2012 statement
NEW ACCOUNTING PRONOUNCEMENTS
Number of separate but consecutive statements	2

Represents the number of separate but consecutive statements in which the entity may present the total of comprehensive income, the components of net income and the components of other comprehensive income, under the amended guidance.

No definition available.

Name:	knl_NumberOfConsecutiveStatements
Namespace Prefix:	knl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration