The Company and Summary of Significant Accounting Policies - Property Plant Equipment (Details) - USD ($)	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Property and equipment
Gross property and equipment	$ 416,289,000	$ 401,053,000
Accumulated depreciation	190,758,000	163,807,000
Net property and equipment	$ 225,531,000	237,246,000
Minimum
Property and equipment
Useful life	1 year
Tangibles, Non-consumable Equipment
Property and equipment
Property, plant and equipment capitalization threshold	$ 3,000
Computer Software and Computer Related Consulting Costs
Property and equipment
Property, plant and equipment capitalization threshold	3,000
Portable Electronic Devices
Property and equipment
Property, plant and equipment capitalization threshold	1,500
Land
Property and equipment
Gross property and equipment	$ 32,843,000	25,543,000
Building
Property and equipment
Useful life	39 years 6 months
Gross property and equipment	$ 38,990,000	38,920,000
Machinery and equipment
Property and equipment
Gross property and equipment	$ 199,602,000	189,085,000
Machinery and equipment \| Minimum
Property and equipment
Useful life	1 year
Machinery and equipment \| Maximum
Property and equipment
Useful life	10 years
Furniture and fixtures
Property and equipment
Gross property and equipment	$ 38,720,000	38,948,000
Furniture and fixtures \| Minimum
Property and equipment
Useful life	1 year
Furniture and fixtures \| Maximum
Property and equipment
Useful life	7 years
Leasehold improvements
Property and equipment
Gross property and equipment	$ 106,134,000	$ 108,557,000
Leasehold improvements \| Minimum
Property and equipment
Useful life	1 year
Leasehold improvements \| Maximum
Property and equipment
Useful life	11 years

Property, Plant and Equipment, Threshold, Value

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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