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Borrowings and Credit Arrangements - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended			1 Months Ended	6 Months Ended	1 Months Ended						6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014 Credit Agreement [Member]	Mar. 30, 2013 Credit Agreement [Member]	Mar. 29, 2014 Credit Agreement [Member]	Mar. 30, 2013 Credit Agreement [Member]	Mar. 29, 2014 Senior Notes [Member]	Mar. 30, 2013 Senior Notes [Member]	Mar. 29, 2014 Senior Notes [Member]	Mar. 30, 2013 Senior Notes [Member]	Dec. 18, 2013 Convertible Notes [Member]	Sep. 28, 2013 Term Loan B [Member] Subsequent Event [Member]	Sep. 28, 2013 Term Loan B [Member] Credit Agreement [Member]	Feb. 26, 2014 Term Loan B [Member] Credit Agreement [Member]	Mar. 29, 2014 Term Loan B [Member] Credit Agreement [Member]	Feb. 26, 2014 Term Loan B [Member] Credit Agreement [Member] Base Rate Floor [Member]	Feb. 26, 2014 Term Loan B [Member] Credit Agreement [Member] Percentage Added to Base Rate [Member]	Feb. 26, 2014 Term Loan B [Member] Credit Agreement [Member] Eurodollar Rate Floor [Member]	Feb. 26, 2014 Term Loan B [Member] Credit Agreement [Member] Percentage Added to Eurodollar Rate [Member]	Nov. 14, 2013 2007 Notes [Member]	Mar. 29, 2014 2007 Notes [Member] Convertible Notes [Member]	Mar. 29, 2014 Term Loan A [Member] Credit Agreement [Member]
Debt Instrument [Line Items]
Prepayment of debt														$ 100,000,000
Debt extinguishment loss	4,437,000	3,247,000	7,377,000	3,247,000											2,900,000
Issue price of principal amount, Senior notes																99.875%
Debt instrument base rate																		1.75%	1.50%	0.75%	2.50%
Prepaid principal amount																25,000,000
Basis point reduction in the interest rate on the New Term Loan B																0.50
Refinancing issuance costs			1,000,000
Weighted average interest rates, Borrowings outstanding under the credit agreement					3.01%		3.01%
Interest rates under Term Loans																	3.25%							2.15%
Interest expense					19,200,000	28,500,000	39,600,000	58,600,000	16,000,000	16,000,000	32,000,000	32,000,000
Non-cash interest expense amortization of debt discount and deferred financing costs			35,820,000	41,387,000	3,200,000	4,100,000	6,500,000	7,800,000	400,000	400,000	800,000	800,000
Third-party costs		2,400,000
Debt instrument maturity date											Aug. 01, 2020
Senior note interest rate per year											6.25%
Redemption price of notes													100.00%
Maturity period																							2037
Notes principal amount																						$ 405,000,000

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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