Consolidating Condensed Statement of Cash Flows Based on Company's Understanding of SEC's Interpretation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 27, 2014	Dec. 28, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	$ 15,852	$ 30,009
Additions to property, plant and equipment	(4,069)	(5,377)
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0	0
Change in restricted cash and cash equivalents	(5,407)	0
Maturities of short term investments	0	3,600
Investment in short term investments	(12)	0
Intercompany investing activities	0	0
Net cash (used) provided by investing activities	(9,488)	(1,777)
Repayments on revolving line of credit	0	(68,000)
Borrowings on revolving line of credit	0	45,000
Repayments of long-term debt	(72)	(76)
Proceeds from issuance of common stock	188	200
Excess tax benefits from stock-based awards	40	171
Repurchase of common stock	(3,742)	(401)
Payment of deferred financing costs	0	(2,985)
Distribution to parent	0	0
Distribution to noncontrolling interest	(1,680)	(633)
Intercompany financing activities	0	0
Net cash provided (used) by financing activities	(5,266)	(26,724)
Effect of exchange rates on cash	(186)	47
Net increase (decrease) in cash and cash equivalents	912	1,555
Cash and equivalents at beginning of period	78,676	15,156
Cash and equivalents at end of period	79,588	16,711
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	(6,874)	(7,093)
Additions to property, plant and equipment	(589)	(1,351)
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0	0
Change in restricted cash and cash equivalents	(5,407)	0
Maturities of short term investments	0	3,600
Investment in short term investments	(12)	0
Intercompany investing activities	(20,431)	(5,660)
Net cash (used) provided by investing activities	(26,439)	(3,411)
Repayments on revolving line of credit	0	(68,000)
Borrowings on revolving line of credit	0	45,000
Repayments of long-term debt	(67)	(39)
Proceeds from issuance of common stock	188	200
Excess tax benefits from stock-based awards	40	171
Repurchase of common stock	(3,742)	(401)
Payment of deferred financing costs	0	(2,985)
Distribution to parent	0	0
Distribution to noncontrolling interest	0	0
Intercompany financing activities	45,450	39,785
Net cash provided (used) by financing activities	41,869	13,731
Effect of exchange rates on cash	(448)	197
Net increase (decrease) in cash and cash equivalents	8,108	3,424
Cash and equivalents at beginning of period	63,471	5,438
Cash and equivalents at end of period	71,579	8,862
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	(1,400)	(1,954)
Additions to property, plant and equipment	(64)	(200)
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0	0
Change in restricted cash and cash equivalents	0	0
Maturities of short term investments	0	0
Investment in short term investments	0	0
Intercompany investing activities	0	0
Net cash (used) provided by investing activities	(64)	(200)
Repayments on revolving line of credit	0	0
Borrowings on revolving line of credit	0	0
Repayments of long-term debt	0	0
Proceeds from issuance of common stock	0	0
Excess tax benefits from stock-based awards	0	0
Repurchase of common stock	0	0
Payment of deferred financing costs	0	0
Distribution to parent	(6,719)	(2,534)
Distribution to noncontrolling interest	(1,680)	(633)
Intercompany financing activities	2,404	2,696
Net cash provided (used) by financing activities	(5,995)	(471)
Effect of exchange rates on cash	158	(98)
Net increase (decrease) in cash and cash equivalents	(7,301)	(2,723)
Cash and equivalents at beginning of period	12,806	7,003
Cash and equivalents at end of period	5,505	4,280
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	30,845	41,590
Additions to property, plant and equipment	(3,416)	(3,826)
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0	0
Change in restricted cash and cash equivalents	0	0
Maturities of short term investments	0	0
Investment in short term investments	0	0
Intercompany investing activities	(27,423)	(36,821)
Net cash (used) provided by investing activities	(30,839)	(40,647)
Repayments on revolving line of credit	0	0
Borrowings on revolving line of credit	0	0
Repayments of long-term debt	(5)	(37)
Proceeds from issuance of common stock	0	0
Excess tax benefits from stock-based awards	0	0
Repurchase of common stock	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
Net cash provided (used) by financing activities	(5)	(37)
Effect of exchange rates on cash	104	(52)
Net increase (decrease) in cash and cash equivalents	105	854
Cash and equivalents at beginning of period	2,399	2,715
Cash and equivalents at end of period	2,504	3,569
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used) provided by operating activities	(6,719)	(2,534)
Additions to property, plant and equipment	0	0
Businesses acquired, net of cash acquired	0	0
Proceeds from disposal of plant and equipment	0	0
Change in restricted cash and cash equivalents	0	0
Maturities of short term investments	0	0
Investment in short term investments	0	0
Intercompany investing activities	47,854	42,481
Net cash (used) provided by investing activities	47,854	42,481
Repayments on revolving line of credit	0	0
Borrowings on revolving line of credit	0	0
Repayments of long-term debt	0	0
Proceeds from issuance of common stock	0	0
Excess tax benefits from stock-based awards	0	0
Repurchase of common stock	0	0
Payment of deferred financing costs	0	0
Distribution to parent	6,719	2,534
Distribution to noncontrolling interest	0	0
Intercompany financing activities	(47,854)	(42,481)
Net cash provided (used) by financing activities	(41,135)	(39,947)
Effect of exchange rates on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and equivalents at beginning of period	0	0
Cash and equivalents at end of period	$ 0	$ 0