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Property, Plant and Equipment
12 Months Ended
Sep. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
7.
Property, Plant and Equipment
 
Depreciation expense of property, plant and equipment for the years ended September 30, 2014, 2013 and 2012 was $9.6 million, $8.6 million and $8.1 million, respectively.
 
The Company leases certain real property, equipment and machinery under noncancelable operating leases. Rental expense under these operating leases for the years ended September 30, 2014, 2013 and 2012 was $5.3 million, $5 million and $5 million, respectively. Future aggregate minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year as of September 30, 2014, are:
 
(Dollars in thousands)
 
 
 
Years ending September 30:
 
 
 
2015
 
$
4,995
 
2016
 
 
3,807
 
2017
 
 
2,555
 
2018
 
 
2,101
 
2019 and thereafter
 
 
2,412
 
Total
 
$
15,870