For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-Name Accounting Standards Codification
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-Section 50
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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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-Section 50
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Employee Benefit Plans (Defined Benefit Plans Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 94.3	$ 99.5
Company's expected contribution to defined benefit pension plans in next fiscal year	$ 5.5
Swiss defined benefit pension plan \| Minimum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	29.50%
Swiss defined benefit pension plan \| Minimum \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	29.00%
Swiss defined benefit pension plan \| Minimum \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	5.00%
Swiss defined benefit pension plan \| Maximum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	36.50%
Swiss defined benefit pension plan \| Maximum \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	39.00%
Swiss defined benefit pension plan \| Maximum \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations	15.00%