GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 28, 2015	Mar. 29, 2014	Dec. 27, 2014
Components of amortized intangible assets
Gross Carrying Amount	$ 221,776		$ 228,027
Accumulated Amortization	105,428		103,050
Amortization expense for intangible assets	4,913us-gaap_AmortizationOfIntangibleAssets	4,103us-gaap_AmortizationOfIntangibleAssets
Estimated amortization expense
2015	17,039
2016	16,607
2017	15,871
2018	14,227
2019	13,423
Customer Relationships
Components of amortized intangible assets
Gross Carrying Amount	201,990		207,509
Accumulated Amortization	90,546		88,538
Weighted Average Life	13 years		13 years
Proprietary Software and Database
Components of amortized intangible assets
Gross Carrying Amount	3,680		3,769
Accumulated Amortization	2,954		2,977
Weighted Average Life	8 years		8 years
Patents and Proprietary Technology
Components of amortized intangible assets
Gross Carrying Amount	12,109		12,394
Accumulated Amortization	8,712		8,537
Weighted Average Life	8 years		8 years
Other
Components of amortized intangible assets
Gross Carrying Amount	3,997		4,355
Accumulated Amortization	$ 3,216		$ 2,998
Weighted Average Life	3 years		3 years

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References