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WARRANTY LIABILITY | 12 Months Ended
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Sep. 30, 2018
Product Warranties Disclosures [Abstract] |
WARRANTY LIABILITY | WARRANTY LIABILITY Telephonics offers warranties against product defects for periods generally ranging from one to two years, depending on the specific product and terms of the customer purchase agreement. CBP also offers warranties against product defects for periods generally ranging from one to ten years, with limited lifetime warranties on certain door models. Typical warranties require AMES, CBP and Telephonics to repair or replace the defective products during the warranty period at no cost to the customer. At the time revenue is recognized, Griffon records a liability for warranty costs, estimated based on historical experience, and periodically assesses its warranty obligations and adjusts the liability as necessary. AMES offers an express limited warranty for a period of ninety days on all products from the date of the original purchase unless otherwise stated on the product or packaging from the date of original purchase. Changes in Griffon’s warranty liability, included in Accrued liabilities, were as follows:
| Years Ended September 30,
| 2018 |  | 2017
Balance, beginning of period | $ | 6,236 |  |  | $ | 6,322 |
Warranties issued and changes in estimated pre-existing warranties | 8,770 |  |  | 6,393 |
Actual warranty costs incurred | (7,948 | ) |  | (6,479 | )
Other warranty liabilities assumed from acquisitions | $ | 1,116 |  |  | $ | — |
Balance, end of period | $ | 8,174 |  |  | $ | 6,236 |

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- Definition The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -URI http://asc.fasb.org/topic&trid=2155896 + Details
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