Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 29, 2014	Sep. 28, 2013	Mar. 28, 2015	Mar. 29, 2014	Mar. 30, 2013
Significant Accounting Policies [Line Items]
Net investment in foreign subsidiaries	$ 55,400		$ 64,300	$ 55,400
Potential loss due to 10% adverse change in foreign exchange rates	5,500		6,400	5,500
Cumulative translation adjustment	400		0	400
Other than temporary impairment of cost based investments	(6,100)	$ (3,600)	$ 4,263	$ 9,703	$ 0
Top ten customers | Net sales
Significant Accounting Policies [Line Items]
Customer concentration risk, percentage			40.00%	41.00%	61.00%
Individually significant customer | Net sales
Significant Accounting Policies [Line Items]
Customer concentration risk, percentage			9.00%	15.00%	31.00%
Minimum | Patents
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets			9 years
Minimum | Other intangible assets
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets			1 year
Maximum | Patents
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets			17 years
Maximum | Other intangible assets
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets				10 years
Omni Guide, Inc.
Significant Accounting Policies [Line Items]
Minority equity investment	4,263		$ 0	$ 4,263
SINGAPORE
Significant Accounting Policies [Line Items]
Cumulative amount of earnings upon which U.S. income taxes have not been provided	28,800		35,300	28,800
Unrecognized deferred tax liability	$ 10,000		12,200	10,000
401(k) plan
Significant Accounting Policies [Line Items]
Contributions to 401(k) during the period			$ 600	$ 200