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Borrowings and Credit Arrangements - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 0 Months Ended |  | 3 Months Ended | 9 Months Ended
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Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 Credit Agreement [Member] | Mar. 29, 2014 Credit Agreement [Member] | Jun. 29, 2013 Credit Agreement [Member] | Jun. 28, 2014 Credit Agreement [Member] | Jun. 29, 2013 Credit Agreement [Member] | Jun. 28, 2014 Senior Notes [Member] | Jun. 29, 2013 Senior Notes [Member] | Jun. 28, 2014 Senior Notes [Member] | Jun. 29, 2013 Senior Notes [Member] | Feb. 26, 2014 Term Loan B [Member] Credit Agreement [Member] | Oct. 31, 2013 Term Loan B [Member] Credit Agreement [Member] | Dec. 28, 2013 Term Loan B [Member] Credit Agreement [Member] | Jun. 28, 2014 Term Loan B [Member] Credit Agreement [Member] | Feb. 26, 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] Convertible Notes [Member] | Nov. 14, 2013 2007 Notes [Member] Convertible Notes [Member] | Mar. 30, 2013 Term Loan A [Member] Credit Agreement [Member] | Jun. 28, 2014 Term Loan A [Member] Credit Agreement [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss | 0 | 0 | 7,400,000 | 3,200,000 |  | 4,400,000 |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  |  |  |  |  |  | 3,200,000 |
Issue price of principal amount, Term Loan B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.875% |  |  |  |  |  |  |  |
Debt Floor Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% |  | 0.75% |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  | 2.50% |  |  |  |
Basis point reduction in the interest rate on the New Term Loan B |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Refinancing issuance costs |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 |
Weighted average interest rates, Borrowings outstanding under the credit agreement |  |  |  |  | 2.76% |  |  | 2.93% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rates under Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  | 2.15%
Interest expense |  |  |  |  | 17,900,000 |  | 26,100,000 | 57,500,000 | 84,700,000 | 16,000,000 | 16,000,000 | 48,000,000 | 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  | 52,200,000 | 61,200,000 | 3,100,000 |  | 3,400,000 | 9,600,000 | 11,200,000 | 400,000 | 400,000 | 1,200,000 | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Senior note interest rate per year |  |  |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 405,000,000 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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