Guarantor Subsidiaries (Narrative) (Details)	12 Months Ended
Dec. 31, 2011
Guarantor Subsidiaries [Abstract]
Percent of Senior Convertible Notes	1.875%
Percent of owned subsidiaries	100.00%

The percentage ownership of the subsidiaries which fully and unconditionally guarantee our convertible notes.

No definition available.

Name:	che_PercentOfOwnedSubsidiaries
Namespace Prefix:	che_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration