Committed Lines Of Credit

No definition available.

Name:	cpk_CommittedLinesOfCredit
Namespace Prefix:	cpk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Uncommitted Lines Of Credit

+ References

No definition available.

+ Details

Name:	cpk_UncommittedLinesOfCredit
Namespace Prefix:	cpk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Short-Term Debt Additional details (Details) (USD $) In Millions, unless otherwise specified						9 Months Ended
	Jun. 30, 2013	Jun. 28, 2013	Jun. 27, 2013	Jun. 28, 2013 Bank of America [Member]	Jun. 30, 2013 PNC Bank [Member]	Sep. 30, 2013 LIBOR [Member] Bank of America [Member]	Sep. 30, 2013 Base Rate [Member] Bank of America [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 75.0	$ 90.0
Debt instrument, description of variable rate basis						1.25%	1250.00%
Committed lines of credit	70.0	55.0
Line of credit facility, current borrowing capacity			50.0
Uncommitted lines of credit	$ 20.0	$ 20.0	$ 30.0