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Debt - Narrative (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 04, 2020 | May 07, 2020 | Oct. 15, 2018 | Sep. 13, 2018 | Dec. 12, 2016 | Oct. 03, 2020 | Jan. 04, 2020 | Oct. 02, 2021 | Oct. 03, 2020 | Sep. 28, 2019 | Sep. 14, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing fees |  |  |  | $ 2,000,000 |  | $ 2,200,000 |  | $ 2,000,000 | $ 2,200,000 |  |
Interest expense |  |  |  |  |  |  |  | 9,700,000 | 12,300,000 | $ 12,900,000 |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 235,000,000 |  |  |  |  |  |
Debt term |  |  |  | 5 years | 5 years |  |  |  |  |  |
Term Loan | Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 160,000,000 |  |  |  |  |  |
Senior Term Loan | Senior Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | $ 176,400,000 |  | $ 166,500,000 | $ 176,400,000 |  |
Stated interest rate (as a percent) |  |  |  |  |  | 3.50% |  | 4.00% | 3.50% |  |
Weighted average interest rate (as a percent) |  |  |  |  |  | 4.10% |  | 6.00% | 4.10% |  |
Revolving Credit Facility | Credit Facility | Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 75,000,000 |  |  |  |  |  | $ 100,000,000
Increase (decrease) to line of credit facility |  |  |  | $ 25,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Credit Facility | Second Amendment To Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 141,900,000 |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 0.75% |  | 0.00% |  |  |  |  |  |  |
Increase of line of credit limit |  | $ 41,900,000 |  |  |  |  |  |  |  |  |
Debt instrument fee amount |  | $ 900,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Facility | Second Amendment To Credit Agreement | Loss on Debt Modification |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lender fees and other issuance costs | $ 100,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Facility | Third Amendment to the Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.50% |  |  |  |  |  |  |  |  |  |
Minimum liquidity required | $ 15,000,000 |  |  |  |  |  |  |  |  |  |
Maximum liquidity allowed | 20,000,000 |  |  |  |  |  |  |  |  |  |
Lender fees and other issuance costs | 2,500,000 |  |  |  |  |  |  |  |  |  |
Long-term line of credit | 100,000,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Facility | Third Amendment to the Credit Agreement | Loss on Debt Modification |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lender fees and other issuance costs | 500,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Facility | Third Amendment to the Credit Agreement | Other Assets |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lender fees and other issuance costs | 1,100,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Facility | Third Amendment to the Credit Agreement | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lender fees and other issuance costs | 900,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Facility | Senior Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 45,000,000 |  |  |
Letters of Credit | Credit Facility | Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 75,000,000 | 15,000,000 |  |  |  |  |  |
Proceeds from lines of credit |  |  | $ 50,000,000 |  |  |  | $ 50,000,000 |  |  |  |
Letters of Credit | Credit Facility | Third Amendment to the Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity | $ 7,000,000 |  |  |  |  |  |  |  |  |  |
Letters of Credit | Credit Facility | Senior Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  |  |  |  |  |  | 6,300,000 |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  | $ 48,700,000 |  |  |
Swingline Credit Facility | Credit Facility | Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 5,000,000 |  |  |  |  |  |
LIBOR | Term Loan | Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 2.25% |  |  |  |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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