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Employee Benefit Plans (Plan Asset Details) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Defined benefit plans
Fair value of plan assets	$ 71,376	$ 65,279	$ 60,910
Level 1
Defined benefit plans
Fair value of plan assets	67,575	61,506
Level 2
Defined benefit plans
Fair value of plan assets	3,801	3,773
Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	11,910	9,315
Cash and cash equivalents | Level 1
Defined benefit plans
Fair value of plan assets	11,864	9,268
Cash and cash equivalents | Level 2
Defined benefit plans
Fair value of plan assets	46	47
Equity securities
Defined benefit plans
Fair value of plan assets	20,985	18,640
Equity securities | Level 1
Defined benefit plans
Fair value of plan assets	20,985	18,640
Debt securities
Defined benefit plans
Fair value of plan assets	22,373	21,781
Debt securities | Level 1
Defined benefit plans
Fair value of plan assets	22,373	21,781
Swiss real estate funds
Defined benefit plans
Fair value of plan assets	9,699	9,622
Swiss real estate funds | Level 1
Defined benefit plans
Fair value of plan assets	9,699	9,622
Hedge funds
Defined benefit plans
Fair value of plan assets	3,507	3,492
Hedge funds | Level 2
Defined benefit plans
Fair value of plan assets	3,507	3,492
Insurance contracts
Defined benefit plans
Fair value of plan assets	61	94
Insurance contracts | Level 2
Defined benefit plans
Fair value of plan assets	61	94
Other
Defined benefit plans
Fair value of plan assets	2,841	2,335
Other | Level 1
Defined benefit plans
Fair value of plan assets	2,654	2,195
Other | Level 2
Defined benefit plans
Fair value of plan assets	$ 187	$ 140

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No definition available.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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