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Revenue Recognition - Cash Flow Statement Impact of Adoption of ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2019 | Apr. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net income | $ 55,944 | $ 28,747 | $ 97,976 | $ 74,799
Accounts receivable and contract assets |  |  | 48,041 | (42,912)
Contract liabilities |  |  | 5,114 | 15,367
Income taxes receivable/payable |  |  | (3,951) | (1,213)
Net cash provided by operating activities |  |  | 99,248 | $ 23,593
Recognition Under Previous Guidance |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net income |  |  | 97,097 |
Accounts receivable and contract assets |  |  | 32,716 |
Contract liabilities |  |  | 21,598 |
Income taxes receivable/payable |  |  | (4,231) |
Net cash provided by operating activities |  |  | 99,248 |
Impact of the Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Net income |  |  | 879 |
Accounts receivable and contract assets |  |  | 15,325 |
Contract liabilities |  |  | (16,484) |
Income taxes receivable/payable |  |  | 280 |
Net cash provided by operating activities |  |  | $ 0 |

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