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Contingencies - Warranty (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 42 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) home | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) home | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) home
Loss Contingencies [Line Items] |  |  |  |  |
Standard product warranty length, minimum |  |  | 1 year |  |
Standard product warranty length, maximum |  |  | 2 years |  |
Limited product warranty length (up to) |  |  | 10 years |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 15,816 | $ 32,309 | $ 18,091 | $ 39,131 |
Accruals for warranties issued | 3,400 | 3,249 | 7,613 | 5,907 |
Changes in liability related to warranties existing in prior periods | (1,097) | 2,463 | (3,394) | 7,855 |
Payments made | (3,536) | (12,635) | (7,727) | (27,507) |
Balance at end of period | 14,583 | 25,386 | 14,583 | 25,386 | $ 14,583
Insurance recoveries | 200 | $ 2,300 | 400 | $ 6,200 | 82,600
Specific Warranty Issue |  |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Product warranty expense |  |  |  |  | 85,000
Specific Warranty Issue | Florida |  |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Balance at end of period | 2,400 |  | 2,400 |  | $ 2,400
Decrease in warranty reserves | $ 200 |  | $ 600 |  |
Homes likely to require more than minor repairs | home | 709 |  | 709 |  | 709
Homes have been repaired | home | 675 |  | 675 |  | 675
Product warranty accrual, payments | $ 600 |  | $ 1,700 |  |
Estimated remaining warranty costs | $ 2,400 |  | $ 2,400 |  | $ 2,400

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