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Revenue Recognition - Cash Flow Statement Impact of Adoption of ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 30, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net income | $ 42,032 | $ 46,052
Accounts receivable and contract assets | 14,528 | (36,011)
Contract liabilities | 6,090 | 12,330
Income taxes receivable/payable | 12,015 | 7,926
Net cash used in operating activities | (15,302) | $ (57,682)
Recognition Under Previous Guidance |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net income | 40,354 |
Accounts receivable and contract assets | 7,574 |
Contract liabilities | 15,248 |
Income taxes receivable/payable | 11,489 |
Net cash used in operating activities | (15,302) |
Impact of the Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net income | 1,678 |
Accounts receivable and contract assets | 6,954 |
Contract liabilities | (9,158) |
Income taxes receivable/payable | 526 |
Net cash used in operating activities | $ 0 |

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