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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

X

- Definition

Standard Product Warranty, Term

+ References

No definition available.

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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

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- 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.

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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

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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

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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

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- Definition

Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

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