Stock-Based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended	0 Months Ended
Jan. 14, 2011 Stock Incentive Plan [Member]	Jan. 31, 2011 Stock Incentive Plan [Member]	Feb. 18, 2011 Restricted Stock [Member]	Feb. 18, 2011 Stock Options [Member]	Feb. 18, 2011 LTIP Award [Member]
Target stock price		62.00
Stock authorized for stock based compensation	41,100
Shares from a discretionary pool	7,350
Stock based compensation expense	$ 3.0		$ 2.3	$ 9.8	$ 2.7
Restricted stock shares authorized					42,000
Shares approved to grant			35,713	513,100
Shares vesting period, years			4	3	4

The number of shares of restricted stock given as a result of a time based long term incentive compensation award given to key employees by the Compensation/Incentive Committee of the Board of Directors.

Name:	che_ShareBasedCompensationNumberOfRestrictedSharesAuthorized
Namespace Prefix:	che
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares of restricted stock issued from a discretionary pool of shares given as a result of a time based long term incentive compensation award given to key employees by the Compensation/Incentive Committee of the Board of Directors.

+ Details

Name:	che_ShareBasedCompensationSharesFromDiscretionaryPool
Namespace Prefix:	che
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Stock price that must be achieved in order for stock award to be granted.

+ Details

Name:	che_ShareBasedCompensationTargetStockPrice
Namespace Prefix:	che
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The vesting period for the stock options or awards given to key employees by the Compensation/Incentive Committee of the Board of Directors.

+ Details

Name:	che_ShareBasedCompensationVestingPeriod
Namespace Prefix:	che
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares of restricted stock or stock options given to key employees by the Compensation/Incentive Committee of the Board of Directors.

+ Details

Name:	che_ShareBasedCompetitionSharesApprovedToGrant
Namespace Prefix:	che
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Cumulative share-based compensation cost of the stock award or stock option granted which will be recognized over the required vesting period (as well as the total recognized tax benefit).

+ Details

Name:	che_StockBasedCompensationExpense
Namespace Prefix:	che
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant