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Long-Term Debt - Components of Long-term Debt (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2019 | Mar. 30, 2019 | Sep. 29, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Dec. 14, 2017 | Nov. 09, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total | $ 697,765,000 | $ 697,765,000 | $ 692,153,000 | $ 691,104,000 |  |  |
Less current portion | (5,119,000) | (5,119,000) | (122,000) | (20,000) |  |  |
Long-term portion | 692,646,000 | 692,646,000 | 692,031,000 | 691,084,000 |  |  |
Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized debt issuance costs | (7,791,000) | (7,791,000) | (8,425,000) | (9,053,000) |  |  |
Total | 692,209,000 | 692,209,000 | 691,575,000 | 690,947,000 |  |  |
Senior notes | Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes | $ 400,000,000 | $ 400,000,000 | 400,000,000 | 400,000,000 |  |  | $ 400,000,000
Debt instrument maturity period |  | Nov. 01, 2023 |  |  |  |  |
Debt instrument interest rate stated, percentage | 6.125% | 6.125% |  |  |  |  | 6.125%
Senior notes | Senior notes, interest at 5.125%, payable semi-annually, principal due February 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes | $ 300,000,000 | $ 300,000,000 | 300,000,000 | 300,000,000 |  | $ 300,000,000.0 |
Total | $ 295,900,000 | $ 295,900,000 | 295,600,000 | 295,300,000 |  |  |
Debt instrument maturity period |  | Feb. 01, 2028 |  |  |  |  |
Debt instrument interest rate stated, percentage | 5.125% | 5.125% |  |  | 5.125% | 5.125% |
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total | $ 0 | $ 0 | 0 | 0 |  |  |
Debt instrument maturity period |  | Apr. 01, 2021 |  |  |  |  |
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Base rate borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility | 0.25% |  |  |  |  |  |
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | LIBOR-based borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility | 1.25% |  |  |  |  |  |
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Minimum | Base rate borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  | 0.25% |  |  |  |  |
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Minimum | LIBOR-based borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  | 1.25% |  |  |  |  |
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Maximum | Base rate borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  | 0.50% |  |  |  |  |
Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Maximum | LIBOR-based borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable interest margin rate on the credit facility |  | 1.50% |  |  |  |  |
Other notes payable |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total | $ 5,556,000 | $ 5,556,000 | $ 578,000 | $ 157,000 |  |  |

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