|
Borrowings and Credit Arrangements - Interest Expense under Convertible Notes (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Mar. 28, 2015
|
Mar. 29, 2014
|
Mar. 28, 2015
|
Mar. 29, 2014
|
|
| Debt Conversion [Line Items] | ||||
| Non-cash interest expense | $ 33.2 | $ 35.8 | ||
| Convertible Notes Payable | ||||
| Debt Conversion [Line Items] | ||||
| Amortization of debt discount | 9.0 | 8.3 | 17.8 | 19.9 |
| Amortization of deferred financing costs | 0.4 | 0.4 | 0.9 | 1.0 |
| Principal accretion | 4.0 | 3.8 | 7.9 | 7.6 |
| Non-cash interest expense | 13.4 | 12.5 | 26.6 | 28.5 |
| 2.00% accrued interest (cash) | 4.8 | 4.8 | 9.5 | 12.9 |
| Convertible Notes Interest Expense | 2.00% | 2.00% | 2.00% | 2.00% |
| Interest expense, net | $ 18.2 | $ 17.3 | $ 36.1 | $ 41.4 |