Impairment Charges	12 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Impairment Charges	(Gain) Loss on Write Down and Disposal of Long-Lived Assets During fiscal year 2018, KEMET 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 are 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. This activity is recorded on the Consolidated Statements of Operations line item "(Gain) loss on write down and disposal of long-lived assets." 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 disposals of long-lived assets. In fiscal year 2017, Film and Electrolytic incurred impairment charges totaling $8.2 million ($0.18 per basic share and $0.15 per diluted share). 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. KFM supplied formed foil to the Company’s Film and Electrolytic Business Group, as well as to certain third party customers. The Company anticipated that Film and Electrolytic will achieve raw material cost savings by purchasing its formed foil from suppliers that have the advantage of lower utility costs. 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. In addition, the Company accrued severance charges and restructuring costs described in Note 4, “Restructuring.” 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. KEMET used a capitalization of income method to estimate fair value taking into account the surface area of the property, the lease price per unit of surface area, and a weighted average cost of capital. The measurements utilized to determine the fair value of the property represent inputs that are observable or can be corroborated by observable market data (Level 2) in accordance with the fair value hierarchy. In fiscal year 2017, Solid Capacitors incurred impairment charges totaling $2.1 million ($0.04 per basic share and $0.04 per diluted share) related to the relocation of our leased K-salt facility to our existing Matamoros, Mexico facility. In addition, the Company accrued severance and equipment relocation charges described in Note 4 “Restructuring” during fiscal year 2017.

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

During fiscal year 2018, KEMET 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 are 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. This activity is recorded on the Consolidated Statements of Operations line item "(Gain) loss on write down and disposal of long-lived assets."

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 disposals of long-lived assets. In fiscal year 2017, Film and Electrolytic incurred impairment charges totaling $8.2 million ($0.18 per basic share and $0.15 per diluted share). 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. KFM supplied formed foil to the Company’s Film and Electrolytic Business Group, as well as to certain third party customers. The Company anticipated that Film and Electrolytic will achieve raw material cost savings by purchasing its formed foil from suppliers that have the advantage of lower utility costs. 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. In addition, the Company accrued severance charges and restructuring costs described in Note 4, “Restructuring.”

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. KEMET used a capitalization of income method to estimate fair value taking into account the surface area of the property, the lease price per unit of surface area, and a weighted average cost of capital. The measurements utilized to determine the fair value of the property represent inputs that are observable or can be corroborated by observable market data (Level 2) in accordance with the fair value hierarchy.

In fiscal year 2017, Solid Capacitors incurred impairment charges totaling $2.1 million ($0.04 per basic share and $0.04 per diluted share) related to the relocation of our leased K-salt facility to our existing Matamoros, Mexico facility. In addition, the Company accrued severance and equipment relocation charges described in Note 4 “Restructuring” during fiscal year 2017.