Borrowings - Additional Information (Detail)	1 Months Ended	12 Months Ended															12 Months Ended								1 Months Ended	12 Months Ended
	Apr. 30, 2014 USD ($)	Sep. 26, 2014 USD ($)	Sep. 27, 2013 USD ($)	Sep. 28, 2012 USD ($)	Sep. 26, 2014 Minimum	Sep. 26, 2014 Maximum	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Term Loan Facility USD ($)	Sep. 27, 2013 Two Thousand Thirteen Credit Agreement Term Loan Facility USD ($)	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Term Loan Facility Scenario Four	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Term Loan Facility Scenario Two	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Term Loan Facility Minimum Scenario One	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Term Loan Facility Maximum Scenario One	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Term Loan Facility Maximum Scenario Three	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility USD ($)	Sep. 27, 2013 Two Thousand Thirteen Credit Agreement Revolving Credit Facility USD ($)	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Scenario Four	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Scenario Two	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Minimum Scenario One	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Minimum Scenario Three	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Maximum Scenario One	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Maximum Scenario Three	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Letter of Credit USD ($)	Sep. 26, 2014 Two Thousand Thirteen Credit Agreement Revolving Credit Facility Swing Line Loans USD ($)	Aug. 27, 2013 Two Thousand Twelve Credit Facility USD ($)	Sep. 26, 2014 Sumitomo Credit Facility USD ($)	Sep. 26, 2014 Sumitomo Credit Facility JPY (¥)	Mar. 28, 2014 Sumitomo Credit Facility USD ($)	Sep. 27, 2013 Sumitomo Credit Facility USD ($)
Line Of Credit Facility [Line Items]
Date of credit agreement							Aug. 27, 2013
Credit facility term								5 years							5 years
Loan facility, maximum borrowing capacity								$ 500,000,000							$ 300,000,000								$ 50,000,000	$ 25,000,000	$ 300,000,000		¥ 3,000,000,000
Loan facility maximum commitment amount								100,000,000							200,000,000
Line of credit, basis spread on variable rate										1.00%	0.50%	1.00%	1.25%	0.25%			1.00%	0.50%	1.25%	0.25%	1.50%	0.50%				0.50%	0.50%
Line of credit, description of interest rate calculation								(i) based on a Eurodollar Rate, as defined in the Credit Agreement (the “Eurodollar Rate”), plus a margin of 1.00% to 1.25% based on a leverage ratio involving funded indebtedness and EBITDA, or (ii) based upon a base rate of (a) the federal funds rate plus 0.50%, (b) BofA’s announced prime rate, or (c) the Eurodollar Rate plus 1.00%, whichever is highest, plus a margin of up to 0.25% based on the same leverage ratio, depending upon instructions from the Company.							(i) based on the Eurodollar Rate plus a margin of 1.25% to 1.50% based on a leverage ratio involving funded indebtedness and EBITDA, or (ii) based upon a base rate of (a) the federal funds rate plus 0.50%, (b) BofA’s announced prime rate, or (c) the Eurodollar Rate plus 1.00%, whichever is highest, plus a margin of 0.25% to 0.50% based on the same leverage ratio, depending upon instructions from the Company.
Percentage added to Eurodollar base rate before margin										1.00%							1.00%
Line of credit, amount outstanding								437,500,000	500,000,000						0	0										0		29,500,000	0
Credit facility weighted average interest rate								1.28%	1.31%
Line of credit facility, commitment fee percentage					0.15%	0.275%
Percentage of voting rights pledged							65.00%
Repayment of outstanding debt amount	6,300,000	68,750,000		9,876,000																					148,000,000
Sumitomo credit facility expiration date																										Mar. 31, 2015	Mar. 31, 2015
Line of credit facility, commitment fee amount		600,000	300,000	300,000
Interest paid on borrowings		7,000,000	2,900,000	3,300,000
Future principal payments for long-term debt for fiscal years 2015		50,000,000
Future principal payments for long-term debt for fiscal years 2016		50,000,000
Future principal payments for long-term debt for fiscal years 2017		50,000,000
Future principal payments for long-term debt for fiscal years 2018		$ 287,500,000