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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
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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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