Impairment Charges	12 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Impairment Charges	(Gain) Loss on Write Down and Disposal of Long-Lived Assets During fiscal year 2019, KEMET recorded a net loss on the write down and disposal of long-lived assets of $1.7 million, which was comprised of $0.7 million in impairment charges and $1.0 million in net losses on the sale and disposal of long-lived assets. The impairment charges were primarily related to the write down of idle land and machinery of $0.5 million and $0.2 million, respectively, at TOKIN. The $1.0 million net loss on write down and disposal of long-lived assets primarily consisted of the disposal of furniture and fixtures resulting from the Company relocation of its corporate headquarters to Fort Lauderdale, Florida and the disposal of old machinery throughout the Company that was no longer being used. These activities are recorded on the Consolidated Statements of Operations line item "(Gain) loss on write down and disposal of long-lived assets." During fiscal year 2018, the Company recorded a net gain on the write down and disposal of long-lived assets of $1.0 million, which was comprised of $1.2 million in net gains on the sale and disposal of long-lived assets offset by $0.2 million in impairment charges. The net gains on the sale and disposal of long-lived assets were primarily related to the sale of equipment, land, and buildings from KFM, which was shut down in fiscal year 2017. On March 13, 2018, the Company sold KFM's land and buildings to a third party for a gross sales price of $3.6 million. The net proceeds realized by the Company were approximately $3.4 million after payment of $0.2 million in closing costs. The Company realized a gain on the sale of the land and buildings of approximately $1.9 million during the year ended March 31, 2018 as a result of the sale. In addition, the Company sold KFM's equipment for a $1.4 million gain. These gains were partially offset by MSA's loss on disposals of assets of $1.3 million primarily related to equipment and buildings used for discontinued products and Solid Capacitors' loss of approximately $0.6 million related to the relocation of its K-Salt operations from a leased facility to its existing Matamoros, Mexico facility. During fiscal year 2017, the Company recorded a net loss on write down and disposal of long-lived assets of $10.7 million, which was comprised of $10.3 million in impairment charges and $0.4 million in net losses on the sale and disposal of long-lived assets. In fiscal year 2017, Film and Electrolytic incurred impairment charges totaling $8.2 million. The impairment charges consisted of the following two actions. On August 31, 2016, KEMET Electronics Corporation, a wholly-owned subsidiary of KEMET made the decision to shut-down operations of its wholly-owned subsidiary, KFM. Operations at KFM’s Knoxville, Tennessee plant ceased as of October 31, 2016. The Company recorded impairment charges related to KFM totaling $4.1 million comprised of $3.0 million for the write down of property plant and equipment and $1.1 million for the write down of intangible assets. The Company also recorded impairment charges of $4.1 million related to a decline in real estate market conditions surrounding its vacated Sasso Marconi, Italy manufacturing facility. In fiscal year 2017, Solid Capacitors incurred impairment charges totaling $2.1 million related to the relocation of its leased K-salt facility to the existing Matamoros, Mexico facility.

(Gain) Loss on Write Down and Disposal of Long-Lived Assets

During fiscal year 2019, KEMET recorded a net loss on the write down and disposal of long-lived assets of $1.7 million, which was comprised of $0.7 million in impairment charges and $1.0 million in net losses on the sale and disposal of long-lived assets. The impairment charges were primarily related to the write down of idle land and machinery of $0.5 million and $0.2 million, respectively, at TOKIN. The $1.0 million net loss on write down and disposal of long-lived assets primarily consisted of the disposal of furniture and fixtures resulting from the Company relocation of its corporate headquarters to Fort Lauderdale, Florida and the disposal of old machinery throughout the Company that was no longer being used. These activities are recorded on the Consolidated Statements of Operations line item "(Gain) loss on write down and disposal of long-lived assets."

During fiscal year 2018, the Company recorded a net gain on the write down and disposal of long-lived assets of $1.0 million, which was comprised of $1.2 million in net gains on the sale and disposal of long-lived assets offset by $0.2 million in impairment charges. The net gains on the sale and disposal of long-lived assets were primarily related to the sale of equipment, land, and buildings from KFM, which was shut down in fiscal year 2017. On March 13, 2018, the Company sold KFM's land and buildings to a third party for a gross sales price of $3.6 million. The net proceeds realized by the Company were approximately $3.4 million after payment of $0.2 million in closing costs. The Company realized a gain on the sale of the land and buildings of approximately $1.9 million during the year ended March 31, 2018 as a result of the sale. In addition, the Company sold KFM's equipment for a $1.4 million gain. These gains were partially offset by MSA's loss on disposals of assets of $1.3 million primarily related to equipment and buildings used for discontinued products and Solid Capacitors' loss of approximately $0.6 million related to the relocation of its K-Salt operations from a leased facility to its existing Matamoros, Mexico facility.

During fiscal year 2017, the Company recorded a net loss on write down and disposal of long-lived assets of $10.7 million, which was comprised of $10.3 million in impairment charges and $0.4 million in net losses on the sale and disposal of long-lived assets. In fiscal year 2017, Film and Electrolytic incurred impairment charges totaling $8.2 million. The impairment charges consisted of the following two actions.

On August 31, 2016, KEMET Electronics Corporation, a wholly-owned subsidiary of KEMET made the decision to shut-down operations of its wholly-owned subsidiary, KFM. Operations at KFM’s Knoxville, Tennessee plant ceased as of October 31, 2016. The Company recorded impairment charges related to KFM totaling $4.1 million comprised of $3.0 million for the write down of property plant and equipment and $1.1 million for the write down of intangible assets.

The Company also recorded impairment charges of $4.1 million related to a decline in real estate market conditions surrounding its vacated Sasso Marconi, Italy manufacturing facility.

In fiscal year 2017, Solid Capacitors incurred impairment charges totaling $2.1 million related to the relocation of its leased K-salt facility to the existing Matamoros, Mexico facility.