Financial Guarantees and Condensed Consolidating Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013	Jun. 29, 2013	Dec. 29, 2012
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Current Maturities	$ 110,326	$ 13,797
Other Liabilities, Noncurrent	64,264	61,845
Liabilities	2,018,657	1,298,458
Liabilities, Current	461,792	328,879
Current assets:
Cash and cash equivalents	211,196	86,064	80,471	97,879
Accounts receivable, net	261,658	194,827
Inventories, net	188,986	156,373
Deferred income taxes	6,906	2,318
Other current assets	105,974	59,096
Total current assets	774,720	498,678
Property, plant and equipment, net of accumulated depreciation of $212,296 and $175,130, respectively	1,037,047	652,468
Goodwill	215,605	107,822
Intangible assets, net	176,125	169,399
Net investment in and advances to (from) subsidiaries	0	0
Deferred income taxes	1,977	2,582
Other noncurrent assets	37,259	26,052
Total assets	2,242,733	1,457,001
Common stock	0	0
Stockholders' Equity Attributable to Parent	132,533	157,700
Noncontrolling interests	91,543	843
Total equity	224,076	158,543
Total liabilities and equity	2,242,733	1,457,001
Short-term borrowings	14,070	2,472
Long-term Debt, Excluding Current Maturities	1,374,496	880,399
Deferred Tax Liabilities, Net, Noncurrent	69,921	27,335
Accounts Payable and Accrued Liabilities, Current	333,360	307,661
Accrued Income Taxes, Current	1,111	3,613
Deferred Tax Liabilities, Net, Current	2,925	1,336
PGI (Issuer)
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Current Maturities	62,090	3,039
Other Liabilities, Noncurrent	407	1,810
Liabilities	1,417,973	893,879
Liabilities, Current	105,543	40,328
Current assets:
Cash and cash equivalents	296	2,068	699	486
Accounts receivable, net	0	0
Inventories, net	(789)	(162)
Deferred income taxes	385	385
Other current assets	17,342	2,049
Total current assets	17,234	4,340
Property, plant and equipment, net of accumulated depreciation of $212,296 and $175,130, respectively	3,636	2,756
Goodwill	0	0
Intangible assets, net	39,348	31,525
Net investment in and advances to (from) subsidiaries	1,489,997	1,012,661
Deferred income taxes	0	0
Other noncurrent assets	291	297
Total assets	1,550,506	1,051,579
Common stock	0	0
Stockholders' Equity Attributable to Parent	132,533	157,700
Noncontrolling interests	0	0
Total equity	132,533	157,700
Total liabilities and equity	1,550,506	1,051,579
Short-term borrowings	719	410
Long-term Debt, Excluding Current Maturities	1,311,050	850,767
Deferred Tax Liabilities, Net, Noncurrent	973	974
Accounts Payable and Accrued Liabilities, Current	42,335	36,510
Accrued Income Taxes, Current	399	369
Deferred Tax Liabilities, Net, Current	0	0
Guarantors
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Current Maturities	0	0
Other Liabilities, Noncurrent	26,833	31,372
Liabilities	96,492	101,375
Liabilities, Current	58,097	61,950
Current assets:
Cash and cash equivalents	121,459	13,103	18,908	28,285
Accounts receivable, net	46,040	46,828
Inventories, net	49,081	46,757
Deferred income taxes	2,439	2,438
Other current assets	12,165	12,534
Total current assets	231,184	121,660
Property, plant and equipment, net of accumulated depreciation of $212,296 and $175,130, respectively	209,166	176,380
Goodwill	37,249	43,182
Intangible assets, net	112,771	112,026
Net investment in and advances to (from) subsidiaries	530,756	627,422
Deferred income taxes	0	0
Other noncurrent assets	8,976	8,870
Total assets	1,130,102	1,089,540
Common stock	0	0
Stockholders' Equity Attributable to Parent	1,033,610	988,165
Noncontrolling interests	0	0
Total equity	1,033,610	988,165
Total liabilities and equity	1,130,102	1,089,540
Short-term borrowings	0	0
Long-term Debt, Excluding Current Maturities	0	0
Deferred Tax Liabilities, Net, Noncurrent	11,562	8,053
Accounts Payable and Accrued Liabilities, Current	57,952	61,950
Accrued Income Taxes, Current	145	0
Deferred Tax Liabilities, Net, Current	0	0
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Current Maturities	48,236	10,758
Other Liabilities, Noncurrent	85,208	28,663
Liabilities	507,015	306,026
Liabilities, Current	297,004	225,453
Current assets:
Cash and cash equivalents	89,441	70,893	60,864	69,108
Accounts receivable, net	215,618	147,999
Inventories, net	140,694	109,778
Deferred income taxes	6,905	2,318
Other current assets	76,467	44,513
Total current assets	529,125	375,501
Property, plant and equipment, net of accumulated depreciation of $212,296 and $175,130, respectively	824,245	473,332
Goodwill	178,356	64,640
Intangible assets, net	24,006	25,848
Net investment in and advances to (from) subsidiaries	(720,955)	(363,414)
Deferred income taxes	1,977	2,582
Other noncurrent assets	27,992	16,885
Total assets	864,746	595,374
Common stock	16,966	16,966
Stockholders' Equity Attributable to Parent	249,222	271,539
Noncontrolling interests	91,543	843
Total equity	357,731	289,348
Total liabilities and equity	864,746	595,374
Short-term borrowings	13,351	2,062
Long-term Debt, Excluding Current Maturities	63,446	29,632
Deferred Tax Liabilities, Net, Noncurrent	61,357	22,278
Accounts Payable and Accrued Liabilities, Current	233,073	209,201
Accrued Income Taxes, Current	567	3,244
Deferred Tax Liabilities, Net, Current	1,777	188
Eliminations
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Current Maturities	0	0
Other Liabilities, Noncurrent	0	0
Liabilities	(2,823)	(2,822)
Liabilities, Current	1,148	1,148
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories, net	0	0
Deferred income taxes	(2,823)	(2,823)
Other current assets	0	0
Total current assets	(2,823)	(2,823)
Property, plant and equipment, net of accumulated depreciation of $212,296 and $175,130, respectively	0	0
Goodwill	0	0
Intangible assets, net	0	0
Net investment in and advances to (from) subsidiaries	(1,299,798)	(1,276,669)
Deferred income taxes	0	0
Other noncurrent assets	0	0
Total assets	(1,302,621)	(1,279,492)
Common stock	(16,966)	(16,966)
Stockholders' Equity Attributable to Parent	(1,282,832)	(1,259,704)
Noncontrolling interests	0	0
Total equity	(1,299,798)	(1,276,670)
Total liabilities and equity	(1,302,621)	(1,279,492)
Short-term borrowings	0	0
Long-term Debt, Excluding Current Maturities	0	0
Deferred Tax Liabilities, Net, Noncurrent	(3,971)	(3,970)
Accounts Payable and Accrued Liabilities, Current	0	0
Accrued Income Taxes, Current	0	0
Deferred Tax Liabilities, Net, Current	1,148	1,148
Maximum [Member]
Condensed Financial Statements, Captions [Line Items]
Other Liabilities, Noncurrent	$ 112,448