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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | 48 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2015
Commitment and Contingency [Line Items] |  |  |  |  |
Rent expense | $ 11.2 | $ 9.9 | $ 10.0 |  |
Private Investment Fund in Start-Up |  |  |  |  |
Commitment and Contingency [Line Items] |  |  |  |  |
Committed capital contribution | 1.1 |  |  | $ 1.1 | $ 4.0
Amount invested in limited partnership |  |  |  | 2.9 |
Parent Guarantee for purchases obligation of third-party contract manufacturer |  |  |  |  |
Commitment and Contingency [Line Items] |  |  |  |  |
Maximum amount of the guarantees | 3.8 |  |  | 3.8 |
Guarantees outstanding | $ 1.0 |  |  | $ 1.0 |
Minimum |  |  |  |  |
Commitment and Contingency [Line Items] |  |  |  |  |
Product warranty period | 1 year |  |  |  |
Maximum |  |  |  |  |
Commitment and Contingency [Line Items] |  |  |  |  |
Product warranty period | 5 years |  |  |  |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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