Property and Equipment (Tables)

6 Months Ended

Mar. 31, 2016

Property, Plant and Equipment [Abstract]

Summary of Property and Equipment by Classification

A summary of property and equipment by classification is as follows:

(In thousands)	March 31, 2016			September 30, 2015
Drilling vessels and equipment	$	3,944,409		$	4,003,483
Construction work in progress	818,580			720,852
Drill pipe	55,768			55,248
Office equipment and other	39,221			36,379
Total cost	4,857,978			4,815,962
Less: Accumulated depreciation	(648,420		)	(643,830		)
Property and equipment, net	$	4,209,558		$	4,172,132