Note 6 - Goodwill and Intangible Assets (Details) - Aggregate Amortization Expenses for Purchased Intangible Assets - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Aggregate Amortization Expenses for Purchased Intangible Assets [Abstract]
Amortization expense	$ 3,405	$ 3,724	$ 6,775	$ 6,001

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Name:	us-gaap_AdjustmentForAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration