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Balance Sheet Details (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Accounts Receivable
Accounts receivable		$ 219,462		$ 219,462		$ 216,089
Less allowance for doubtful accounts		(11,008)		(11,008)		(9,563)
Total		208,454		208,454		206,526
Inventories
Raw materials		140,275		140,275		129,645
Work-in-process		77,922		77,922		65,454
Finished goods		62,836		62,836		53,411
Total		281,033		281,033		248,510
Property and Equipment
Property and equipment, gross		421,152		421,152		389,655
Less accumulated depreciation and amortization		(277,882)		(277,882)		(248,116)
Property and equipment, net		143,270		143,270		141,539
Depreciation expense		16,800	$ 13,400	33,000	$ 26,700
AS&E facility in Billerica, MA
Property and Equipment
Purchase of property and equipment	$ 19,800
Land
Property and Equipment
Property and equipment, gross		17,129		17,129		14,212
Land | AS&E facility in Billerica, MA
Property and Equipment
Purchase of property and equipment	2,900
Buildings, civil works and improvements
Property and Equipment
Property and equipment, gross		179,643		$ 179,643		157,123
Buildings, civil works and improvements | Minimum
Property and Equipment
Estimated Useful Lives				5 years
Buildings, civil works and improvements | Maximum
Property and Equipment
Estimated Useful Lives				40 years
Buildings, civil works and improvements | AS&E facility in Billerica, MA
Property and Equipment
Purchase of property and equipment	$ 16,900
Leasehold improvements
Property and Equipment
Property and equipment, gross		9,308		$ 9,308		9,025
Leasehold improvements | Minimum
Property and Equipment
Estimated Useful Lives				1 year
Leasehold improvements | Maximum
Property and Equipment
Estimated Useful Lives				12 years
Equipment and tooling
Property and Equipment
Property and equipment, gross		170,372		$ 170,372		166,991
Equipment and tooling | Minimum
Property and Equipment
Estimated Useful Lives				3 years
Equipment and tooling | Maximum
Property and Equipment
Estimated Useful Lives				10 years
Furniture and fixtures
Property and Equipment
Property and equipment, gross		3,427		$ 3,427		3,371
Furniture and fixtures | Minimum
Property and Equipment
Estimated Useful Lives				3 years
Furniture and fixtures | Maximum
Property and Equipment
Estimated Useful Lives				13 years
Computer equipment
Property and Equipment
Property and equipment, gross		19,054		$ 19,054		17,991
Computer equipment | Minimum
Property and Equipment
Estimated Useful Lives				3 years
Computer equipment | Maximum
Property and Equipment
Estimated Useful Lives				5 years
Computer Software
Property and Equipment
Property and equipment, gross		17,844		$ 17,844		17,303
Computer Software | Minimum
Property and Equipment
Estimated Useful Lives				3 years
Computer Software | Maximum
Property and Equipment
Estimated Useful Lives				10 years
Computer software implementation in process
Property and Equipment
Property and equipment, gross		3,676		$ 3,676		2,590
Construction in process
Property and Equipment
Property and equipment, gross		$ 699		$ 699		$ 1,049

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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