Property and Equipment (Tables)

6 Months Ended

Mar. 31, 2015

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, 2015			September 30, 2014
Drilling vessels and equipment	$	4,026,004		$	4,181,774
Construction work in progress	471,046			319,548
Drill pipe	42,576			31,265
Office equipment and other	36,035			35,566
Total cost	4,575,661			4,568,153
Less: Accumulated depreciation	(564,970		)	(601,125		)
Property and equipment, net	$	4,010,691		$	3,967,028

Schedule of Expected Delivery Dates and Status

The expected delivery dates of the Atwood Admiral and Atwood Archer are as follows:

	Atwood Admiral		Atwood Archer
	Expected Delivery	Status	Expected Delivery	Status
Prior to supplemental agreements	3/31/2015		12/31/2015
Supplemental Agreement No. 1:	9/30/2015	Exercised	6/30/2016	Exercised
Supplemental Agreement No. 2:
Option No. 1	3/31/2016	Exercised	12/31/2016	Unexercised
Option No. 2	9/30/2016	Unexercised	6/30/2017	Unexercised

Long-term Purchase Commitment

expected payments for the Atwood Admiral and Atwood Archer as impacted by Supplemental Agreement No. 1 and Supplemental Agreement No. 2 are as follows:

(In millions)	Date	Atwood Admiral		Atwood Archer
Milestone	6/30/2015	$	25	$	25
Milestone	9/30/2015	150
Final payment	3/31/2016	146
Final payment	6/30/2016			358
Total		$	321	$	383