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Property, Plant and Equipment
6 Months Ended
Mar. 27, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
9.
Property, Plant and Equipment
The gross carrying amount and accumulated depreciation of property, plant and equipment at the end of each period was as follows:
 
March 27,
2015
 
September 26, 2014
Property, plant and equipment, gross
$
1,900.0

 
$
1,888.4

Less: accumulated depreciation
(959.1
)
 
(939.2
)
Property, plant and equipment, net
$
940.9

 
$
949.2



Depreciation expense for property, plant and equipment was $27.0 million and $26.1 million during the three months ended March 27, 2015 and March 28, 2014, respectively, and $52.1 million and $52.4 million during the six months ended March 27, 2015 and March 28, 2014, respectively. Depreciation expense included depreciation on demonstration equipment of $0.5 million and $0.9 million for the three months ended March 27, 2015 and March 28, 2014, respectively, and $0.9 million and $2.0 million for the six months ended March 27, 2015 and March 28, 2014, respectively. Demonstration equipment was included within other assets on the unaudited condensed consolidated balance sheets.