WARRANTY LIABILITY
 6 Months Ended
Mar. 31, 2015
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. Typical warranties require 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 original purchase unless otherwise stated on the product or packaging.

Changes in Griffon’s warranty liability, included in Accrued liabilities, were as follows:
 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
2015
 
2014
 
2015
 
2014
Balance, beginning of period
$
4,908

 
$
6,929

 
$
4,934

 
$
6,649

Warranties issued and changes in estimated pre-existing warranties
1,842

 
1,135

 
2,791

 
2,101

Actual warranty costs incurred
(1,076
)
 
(953
)
 
(2,051
)
 
(1,639
)
Balance, end of period
$
5,674

 
$
7,111

 
$
5,674

 
$
7,111