|
Debt - Additional Information (Detail) (Revolving Credit Facilities [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Dec. 28, 2012
|
Sep. 30, 2011
|
Sep. 28, 2012
|
|
| Debt Instrument [Line Items] | |||
| Revolving credit facility maturity date | Sep. 30, 2016 | ||
| Revolving credit facility maximum borrowing availability | $ 150.0 | ||
| Revolving credit facility interest date | Borrowings under the revolving credit facility bear a variable interest rate equal to (i) the greater of the lender's prime rate, the federal funds effective rate plus 0.5%, or an adjusted LIBOR plus 1.0%, in each case plus either an additional 1.25%, 1.50% or 1.75%, subject to certain conditions, or (ii) an adjusted LIBOR rate plus either 2.25%, 2.50% or 2.75%, subject to certain conditions. | ||
| Revolving credit facility, LIBOR rate | Adjusted LIBOR plus 1.0% | ||
| Revolving credit facility federal funds effective rate | Federal funds effective rate plus 0.5% | ||
| Federal funds effective rate | 0.50% | ||
| LIBOR rate | 1.00% | ||
| Outstanding borrowing under revolving credit facility | $ 0 | $ 0 | |
|
Interest Rate LIBOR One [Member]
|
|||
| Debt Instrument [Line Items] | |||
| Adjusted LIBOR rate percentage | 1.25% | ||
|
Interest Rate LIBOR Two [Member]
|
|||
| Debt Instrument [Line Items] | |||
| Adjusted LIBOR rate percentage | 1.50% | ||
|
Interest Rate LIBOR Three [Member]
|
|||
| Debt Instrument [Line Items] | |||
| Adjusted LIBOR rate percentage | 1.75% | ||
|
Interest Rate LIBOR Four [Member]
|
|||
| Debt Instrument [Line Items] | |||
| Adjusted LIBOR rate percentage | 2.25% | ||
|
Interest Rate LIBOR Five [Member]
|
|||
| Debt Instrument [Line Items] | |||
| Adjusted LIBOR rate percentage | 2.50% | ||
|
Interest Rate LIBOR Six [Member]
|
|||
| Debt Instrument [Line Items] | |||
| Adjusted LIBOR rate percentage | 2.75% |