Property and Equipment (Tables)

9 Months Ended

Jun. 30, 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)	June 30, 2016			September 30, 2015
Drilling vessels and equipment	$	3,951,885		$	4,003,483
Construction work in progress	843,778			720,852
Drill pipe	52,725			55,248
Office equipment and other	39,155			36,379
Total cost	4,887,543			4,815,962
Less: Accumulated depreciation	(689,474		)	(643,830		)
Property and equipment, net	$	4,198,069		$	4,172,132