Represents the amount agreed to be advanced to the entity under an agreement with OEM.

No definition available.

Name:	kem_AmountAgreedToBeAdvanced
Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount of cash balance to be maintained by the entity on the last day of any fiscal quarter in compliance with the covenant clauses of the debt agreement.

+ References

No definition available.

+ Details

Name:	kem_DebtInstrumentCovenantCashBalanceOnLastDayOfFiscalQuarter
Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the percentage of consolidated total assets accounted by subsidiary which applies for judicial or extra judicial settlement with its creditors, makes an assignment for the benefit of its creditors, voluntarily files for bankruptcy or has a receiver or trustee in bankruptcy appointed by reason of its insolvency, or in the event of an involuntary bankruptcy action, liquidation proceeding, dissolution or similar proceeding.

+ References

No definition available.

+ Details

Name:	kem_DebtInstrumentCovenantPercentageOfConsolidatedTotalAssetsAccountedBySubsidiaryWhichAppliesForSettlementOrBankruptcyOrOtherSimilarProceeding
Namespace Prefix:	kem_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period within which any proceeding filed against the entity is to be dismissed in compliance with the covenant clauses of the debt agreement.

+ References

No definition available.

+ Details

Name:	kem_DebtInstrumentCovenantPeriodWithInWhichDissolutionOrSimilarProceedingToBeDismissed
Namespace Prefix:	kem_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the monthly payment required when the price ratio is above the established threshold.

+ References

No definition available.

+ Details

Name:	kem_MonthlyAmountOfPaymentAboveThreshold
Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the monthly payment required when the price ratio is below the established threshold.

+ References

No definition available.

+ Details

Name:	kem_MonthlyAmountOfPaymentBelowThreshold
Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the ratio of the entity's price to OEM compared to OEM's price from another party which triggers increase in maximum monthly repayment of advance.

+ References

No definition available.

+ Details

Name:	kem_MonthlyRepaymentThresholdRatioOfPriceToCompetitorPrice
Namespace Prefix:	kem_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period after which advance payment's outstanding amount due in full under an agreement with OEM.

+ References

No definition available.

+ Details

Name:	kem_PeriodAfterWhichAdvancePaymentIsDueInFull
Namespace Prefix:	kem_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period of when repayment of advance amount begins under an agreement with OEM.

+ References

No definition available.

+ Details

Name:	kem_PeriodToBeginRepaymentOfAdvanceAmount
Namespace Prefix:	kem_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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

- Details

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

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

Debt - Advanced Payment from OEM Narrative (Details) (USD $)				0 Months Ended	1 Months Ended		0 Months Ended				12 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Advanced payment from OEM	Mar. 31, 2013 Advanced payment from OEM	Aug. 28, 2012 OEM	Jun. 30, 2013 OEM	Oct. 08, 2012 OEM	Aug. 28, 2012 OEM Maximum	Aug. 28, 2012 OEM Advanced payment from OEM	Mar. 31, 2014 OEM Advanced payment from OEM	Mar. 31, 2013 OEM Advanced payment from OEM	Mar. 31, 2014 OEM Advanced payment from OEM Maximum	Mar. 31, 2014 OEM Advanced payment from OEM Minimum
Debt Instrument [Line Items]
Amount agreed to be advanced	$ 24,000,000			$ 24,000,000
Long-term debt									20,400,000	24,000,000
Period of payment of advanced amount as percentage of aggregate purchase price of capacitors					8 months
Monthly repayment of advanced amount, price ratio below threshold							1,000,000
Monthly repayment of advanced amount, price ratio above threshold							2,000,000
Threshold price ratio (as a percent)				110.00%				110.00%
Period after which outstanding balance of advance payment is due in full				32 months
Amount of irrevocable standby letter of credit delivered						16,000,000
Unamortized discount		323,000	1,056,000
Cash balance to be maintained on last day of any fiscal quarter												$ 60,000,000
Percentage of consolidated total assets accounted by subsidiary which applies for bankruptcy or other similar proceedings												20.00%
Period within which any proceeding filed against the entity is to be dismissed											60 days