Represents the working capital adjustment associated with the acquisition of the acquired entity.

No definition available.

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Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents future potential purchase price of acquisition, as specified in financial agreement.

+ References

No definition available.

+ Details

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

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Expenses

+ References

No definition available.

+ Details

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Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equity Method Investment

+ References

No definition available.

+ Details

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Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
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- Definition

Change in Deferred Income Tax Liability due to update of excess cash calculation

+ References

No definition available.

+ Details

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Namespace Prefix:	kem_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the number of manufacturing sites operated by the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	kem_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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Period Type:	duration

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (h)(2)-(3)
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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 2
-Subparagraph (h)(2)-(3)
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Balance Type:	credit
Period Type:	duration

- Definition

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 30
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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

For indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the indemnification benefit which may be realized.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

+ Details

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

- Definition

Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

+ References

+ Details

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

- Definition

Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

+ References

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

+ References

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

- Definition

Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

+ References

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

- Definition

Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31917-109318

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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

- Definition

The amount of inventory recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464

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

- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 37
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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

- Definition

Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

+ Details

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

- Definition

Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

+ References

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

- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

+ Details

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

- Definition

Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(1)
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(2)
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 3
-Subparagraph (a)(1)
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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Definition

Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The fair value of assets acquired in noncash investing or financing activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (SX 210.5-03(12))
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-Paragraph 1
-Subparagraph (SX 210.9-04(13)(f))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
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Namespace Prefix:	us-gaap_
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- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2646-109256

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Acquisitions (Details) $ / shares in Units, shares in Thousands, $ in Thousands, ¥ in Billions			1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 19, 2017 USD ($)	Apr. 19, 2017 JPY (¥)	Apr. 19, 2017 USD ($)	Sep. 30, 2017 USD ($) manufacturing_site $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) manufacturing_site $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2017 JPY (¥) manufacturing_site	Apr. 19, 2017 JPY (¥)	Apr. 14, 2017 USD ($)	Apr. 14, 2017 JPY (¥)	Apr. 09, 2017 Rate	Mar. 31, 2017 USD ($) Rate	Jun. 30, 2016	Jun. 30, 2015	Mar. 12, 2012
Business Acquisition [Line Items]
Foreign Currency Exchange Rate, Translation \| Rate												10900.70%	11182.30%
Fair Value of Assets Acquired	$ (422,623)
Pro forma revenues					$ 264,619		$ 522,128
Pro forma net income (loss) from continuing operations available to common stockholders					$ (5,379)		$ 248,230
Pro forma earnings per common share - basic \| $ / shares				$ 0.23	$ (0.12)	$ 0.53	$ 5.34
Pro forma earnings per common share - diluted \| $ / shares				$ 0.20	$ (0.12)	$ 0.44	$ 4.68
Pro forma common shares - basic \| shares				49,819	46,590	48,607	46,471
Pro forma common shares - diluted \| shares				58,409	46,590	58,136	46,471
Equity income (loss) from equity method investments			$ 75,417	$ 224	$ 181	$ 75,641	$ 404
Business Combination, Bargain Purchase, Gain Recognized, Amount				(1,285)	0	(136,873)	0
Business Acquisition Cost of Acquired Entity Working Capital Adjustment				0		0		¥ 0.3
Change in Deferred Income Tax Liability				700
TOKIN [Member]
Business Acquisition [Line Items]
Cash				315,743		315,743
Accounts Receivable				79,295		79,295
Inventory				35,310		35,310
Other current assets				20,899		20,899
Property, Plant and equipment				159,597		159,597
Intangible assets				35,452		35,452
Equity method investments				12,795		12,795
Other assets				8,533		8,533
Current portion of long term debt				(3,225)		(3,225)
Accounts payable				(81,642)		(81,642)
Accrued expenses				(46,276)		(46,276)
Other non-current obligations				(103,486)		(103,486)
Deferred income taxes (2)				(10,372)		(10,372)
Total net assets acquired				422,623		$ 422,623
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						10 years
Business Acquisition, Transaction Costs				$ 600		$ 600
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net					72,400	$ 72,400
Business Combination, Bargain Purchase, Gain Recognized, Amount	$ (64,442)				(65,900)
KEC [Member] \| TOKIN [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage	100.00%		100.00%						100.00%
Business Acquisition, Percentage of Voting Interests Acquired	66.00%		66.00%						66.00%
Business Combination, Consideration Transferred	$ 148,600	¥ 16.2
Payments to Acquire Businesses, Gross \| ¥		6.0
TOKIN [Member]
Business Acquisition [Line Items]
Number of Manufacturing Sites \| manufacturing_site				6		6		6
Disposal Group, Including Discontinued Operation, Consideration									¥ 10.2	$ 431,000	¥ 48.2
TOKIN [Member] \| Cash Distribution [Member]
Business Acquisition [Line Items]
Business Acquisition Potential Future Purchase Price	148,614		$ 148,614
TOKIN [Member] \| Contingent Consideration Type [Domain]
Business Acquisition [Line Items]
Business Acquisition Potential Future Purchase Price	150,358		150,358
TOKIN [Member] \| Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Business Acquisition Potential Future Purchase Price	3,144		3,144
TOKIN [Member] \| Other Assets [Member]
Business Acquisition [Line Items]
Business Acquisition Potential Future Purchase Price	8,500		8,500
TOKIN [Member] \| Put Option [Member]
Business Acquisition [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	(9,900)		(9,900)
Business Acquisition Potential Future Purchase Price	(9,900)		(9,900)
Fair Value, Measurements, Recurring [Member]
Business Acquisition [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs				$ 0		$ 0							$ (9,900)
NEC TOKIN Corporation [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage				34.00%		34.00%		34.00%							34.00%
Equity income (loss) from equity method investments							$ 404
TOKIN [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage															34.00%
Equity income (loss) from equity method investments			$ 75,177	$ 123,400	$ 181
Stock Purchase Agreement [Member] \| NEC TOKIN Corporation [Member] \| KEMET Electronics Corporation [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage														34.00%		34.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	207,823
Pro Forma [Member]
Business Acquisition [Line Items]
Pro forma common shares - diluted \| shares							53,044
Equity Method Investments [Member] \| Stockholders Agreement [Member]
Business Acquisition [Line Items]
Business Combination, Indemnification Assets, Amount as of Acquisition Date				25,000		$ 25,000
Trade name \| TOKIN [Member]
Business Acquisition [Line Items]
Intangible assets				8,100		8,100
Products and relationships \| TOKIN [Member]
Business Acquisition [Line Items]
Intangible assets				$ 25,200		$ 25,200
Excess cash [Member] \| KEC [Member] \| TOKIN [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	93,600	10.2
Cash Distribution [Member] \| KEC [Member] \| TOKIN [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 55,000	¥ 6.0