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Property And Equipment
6 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Property and Equipment
PROPERTY AND EQUIPMENT

A summary of property and equipment by classification is as follows:
 
(In thousands)
March 31,
2013
 
September 30,
2012
Drilling vessels and equipment
$
2,760,263

 
$
2,523,895

Construction work in progress
602,127

 
438,081

Drill pipe
22,193

 
20,576

Office equipment and other
23,625

 
19,610

Cost
3,408,208

 
3,002,162

Less: Accumulated depreciation
(519,973
)
 
(464,822
)
Drilling and other property and equipment, net
$
2,888,235

 
$
2,537,340



Property and equipment are recorded at cost. Interest incurred related to property under construction is capitalized as a component of construction costs. Interest capitalized during the three months ended March 31, 2013 and 2012 was approximately $6.5 million and $9.6 million, respectively, and the six months ended March 31, 2013, and 2012, was $15.6 million and $16.0 million, respectively.

Construction Projects

As of March 31, 2013, we had expended approximately $590 million towards our four drilling units under construction. Total remaining firm commitments for our four drilling units currently under construction were approximately $1.1 billion at March 31, 2013.