Note 12 - Benefit Plans (Details) - Benefit Plan Related Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	$ 134,753	$ 110,593
Benefit obligation at end of year	158,499	134,753
Fair value of plan assets at beginning of year	126,225	88,901
Fair value of plan assets at end of year	141,584	126,225
Net amount recognized/(unfunded status)	(16,915)	(8,528)
Current portion of accrued benefit liability	(11,768)
Accrued benefit liability	(5,147)	(8,528)
Total liability recognized	(16,915)	(8,528)
Accumulated other comprehensive loss	42,472	23,689
Service cost	1,525	1,344
Interest cost	5,944	4,941
Net actuarial loss (gain)	27,677	(8,743)
Actual return on plan assets	15,557	5,679
Employer contributions	10,596	9,109
Benefits paid	(7,697)	(6,831)
Acquisition		26,904
Effect of exchange rate movements	(3,096)	2,464
Benefits paid directly by company	(155)	(112)
Acquisition		31,041
Effect of exchange rate movements	(3,548)	2,520
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	84,422	95,187
Benefit obligation at end of year	105,759	84,422	95,187
Fair value of plan assets at beginning of year	83,748	77,949
Fair value of plan assets at end of year	93,991	83,748	77,949
Net amount recognized/(unfunded status)	(11,768)	(674)
Current portion of accrued benefit liability	(11,768)
Accrued benefit liability		(674)
Total liability recognized	(11,768)	(674)
Accumulated other comprehensive loss	34,801	18,095
Service cost	600	600	600
Interest cost	3,884	3,565	4,962
Net actuarial loss (gain)	22,025	(9,854)
Actual return on plan assets	10,416	5,875
Employer contributions	5,000	5,000
Benefits paid	(5,172)	(5,076)
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	50,331	15,406
Benefit obligation at end of year	52,740	50,331	15,406
Fair value of plan assets at beginning of year	42,477	10,952
Fair value of plan assets at end of year	47,593	42,477	10,952
Net amount recognized/(unfunded status)	(5,147)	(7,854)
Accrued benefit liability	(5,147)	(7,854)
Total liability recognized	(5,147)	(7,854)
Accumulated other comprehensive loss	7,671	5,594
Service cost	925	744	601
Interest cost	2,060	1,376	644
Net actuarial loss (gain)	5,652	1,111
Actual return on plan assets	5,141	(196)
Employer contributions	5,596	4,109
Benefits paid	(2,525)	(1,755)
Acquisition		26,904
Effect of exchange rate movements	(3,096)	2,464
Benefits paid directly by company	(155)	(112)
Acquisition		31,041
Effect of exchange rate movements	$ (3,548)	$ 2,520