Consolidating Condensed Statement of Cash Flows Based on Company's Understanding of SEC's Interpretation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	$ 126,467	$ (28,282)	$ 89,169
Additions to property, plant and equipment	(17,173)	(25,172)	(39,592)
Businesses acquired, net of cash acquired	(20,282)	(4,835)	0
Proceeds from disposal of plant and equipment	8,737
Change in restricted cash and cash equivalents	(14,283)	0	0
Maturities of short term investments	17,820	4,885	0
Investment in short term investments	(10,000)	0	(4,885)
Intercompany investing activities	0	0	0
Net cash (used) provided by investing activities	(35,181)	(25,122)	(44,477)
Repayments on revolving line of credit	(301,000)	(368,000)	(339,000)
Borrowings on revolving line of credit	278,000	391,000	304,000
Repayments of long-term debt	(367)	(332)	(353)
Proceeds from the issuance of long-term debt	0	0	49,312
Proceeds from issuance of common stock	1,165	613	2,129
Excess tax benefits from stock-based awards	498	388	1,881
Repurchase of common stock	(2,332)	(2,731)	(24,829)
Payment of deferred financing costs	(3,090)	0	(1,715)
Distribution to parent	0	0
Distribution to noncontrolling interest	(633)	(629)	0
Intercompany financing activities	0	0	0
Net cash provided (used) by financing activities	(27,759)	20,309	(8,575)
Effect of exchange rates on cash	(7)	(224)	327
Net increase (decrease) in cash and cash equivalents	63,520	(33,319)	36,444
Cash and cash equivalents at beginning of year	15,156	48,475	12,031
Cash and cash equivalents at end of year	78,676	15,156	48,475
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	(4,139)	(31,250)	7,978
Additions to property, plant and equipment	(6,721)	(8,656)	(20,357)
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0
Change in restricted cash and cash equivalents	(14,283)
Maturities of short term investments	17,820	4,885
Investment in short term investments	(10,000)		(4,885)
Intercompany investing activities	(6,726)	8,986	5,153
Net cash (used) provided by investing activities	(19,910)	5,215	(20,089)
Repayments on revolving line of credit	(301,000)	(368,000)	(339,000)
Borrowings on revolving line of credit	278,000	391,000	304,000
Repayments of long-term debt	(243)	(206)	(231)
Proceeds from the issuance of long-term debt			49,312
Proceeds from issuance of common stock	1,165	613	2,129
Excess tax benefits from stock-based awards	498	388	1,881
Repurchase of common stock	(2,332)	(2,731)	(24,829)
Payment of deferred financing costs	(3,090)		(1,715)
Distribution to parent	0	0
Distribution to noncontrolling interest	0	0
Intercompany financing activities	109,057	(28,896)	50,750
Net cash provided (used) by financing activities	82,055	(7,832)	42,297
Effect of exchange rates on cash	27	36	374
Net increase (decrease) in cash and cash equivalents	58,033	(33,831)	30,560
Cash and cash equivalents at beginning of year	5,438	39,269	8,709
Cash and cash equivalents at end of year	63,471	5,438	39,269
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	7,420	(11,632)	16,008
Additions to property, plant and equipment	(1,027)	(337)	(378)
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0
Change in restricted cash and cash equivalents	0
Maturities of short term investments	0	0
Investment in short term investments	0		0
Intercompany investing activities	0	0	0
Net cash (used) provided by investing activities	(1,027)	(337)	(378)
Repayments on revolving line of credit	0	0	0
Borrowings on revolving line of credit	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from the issuance of long-term debt			0
Proceeds from issuance of common stock	0	0	0
Excess tax benefits from stock-based awards	0	0	0
Repurchase of common stock	0	0	0
Payment of deferred financing costs	0		0
Distribution to parent	(2,534)	(2,516)
Distribution to noncontrolling interest	(633)	(629)
Intercompany financing activities	2,595	16,987	(12,222)
Net cash provided (used) by financing activities	(572)	13,842	(12,222)
Effect of exchange rates on cash	(18)	(263)	61
Net increase (decrease) in cash and cash equivalents	5,803	1,610	3,469
Cash and cash equivalents at beginning of year	7,003	5,393	1,924
Cash and cash equivalents at end of year	12,806	7,003	5,393
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	125,720	17,116	65,183
Additions to property, plant and equipment	(9,425)	(16,179)	(18,857)
Businesses acquired, net of cash acquired	(20,282)	(4,835)
Proceeds from disposal of plant and equipment	8,737
Change in restricted cash and cash equivalents	0
Maturities of short term investments	0	0
Investment in short term investments	0		0
Intercompany investing activities	(104,926)	2,923	(43,681)
Net cash (used) provided by investing activities	(125,896)	(18,091)	(62,538)
Repayments on revolving line of credit	0	0	0
Borrowings on revolving line of credit	0	0	0
Repayments of long-term debt	(124)	(126)	(122)
Proceeds from the issuance of long-term debt			0
Proceeds from issuance of common stock	0	0	0
Excess tax benefits from stock-based awards	0	0	0
Repurchase of common stock	0	0	0
Payment of deferred financing costs	0		0
Distribution to parent	0	0
Distribution to noncontrolling interest	0	0
Intercompany financing activities	0	0	0
Net cash provided (used) by financing activities	(124)	(126)	(122)
Effect of exchange rates on cash	(16)	3	(108)
Net increase (decrease) in cash and cash equivalents	(316)	(1,098)	2,415
Cash and cash equivalents at beginning of year	2,715	3,813	1,398
Cash and cash equivalents at end of year	2,399	2,715	3,813
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	(2,534)	(2,516)	0
Additions to property, plant and equipment	0	0	0
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0
Change in restricted cash and cash equivalents	0
Maturities of short term investments	0	0
Investment in short term investments	0		0
Intercompany investing activities	111,652	(11,909)	38,528
Net cash (used) provided by investing activities	111,652	(11,909)	38,528
Repayments on revolving line of credit	0	0	0
Borrowings on revolving line of credit	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from the issuance of long-term debt			0
Proceeds from issuance of common stock	0	0	0
Excess tax benefits from stock-based awards	0	0	0
Repurchase of common stock	0	0	0
Payment of deferred financing costs	0		0
Distribution to parent	2,534	2,516
Distribution to noncontrolling interest	0	0
Intercompany financing activities	(111,652)	11,909	(38,528)
Net cash provided (used) by financing activities	(109,118)	14,425	(38,528)
Effect of exchange rates on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	$ 0	$ 0	$ 0