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Contingencies (Tables)
 6 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Warranty reserves
Changes in warranty reserves are as follows for the periods presented:
 
Three Months Ended
 
Six Months Ended
 
March 31,
 
March 31,
in thousands
2019
 
2018
 
2019
 
2018
Balance at beginning of period
$
13,432

 
$
15,816

 
$
15,331

 
$
18,091

Accruals for warranties issued (a)
2,490

 
3,400

 
4,854

 
7,613

Changes in liability related to warranties existing in prior periods
(663
)
 
(1,097
)
 
(1,968
)
 
(3,394
)
Payments made
(2,674
)
 
(3,536
)
 
(5,632
)
 
(7,727
)
Balance at end of period
$
12,585

 
$
14,583

 
$
12,585

 
$
14,583

(a) Accruals for warranties issued are a function of the number of home closings in the period, the selling prices of the homes closed, and the rates of accrual per home estimated as a percentage of the selling price of the home.