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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]  
Estimated Useful Lives of Assets
Our estimated useful lives of our various classifications of assets are as follows:
 
 
Years
Drilling vessels and related equipment
5-35
Drill pipe
3
Furniture and other
3-10
 
September 30,
(In thousands)
2014
 
2013
Drilling vessels and equipment
$
4,181,774

 
$
2,979,503

Construction work in progress
319,548

 
715,320

Drill pipe
31,265

 
26,743

Office equipment and other
35,566

 
24,439

Total cost
4,568,153

 
3,746,005

Less: Accumulated depreciation
(601,125
)
 
(581,281
)
 Property and equipment, net
$
3,967,028

 
$
3,164,724
Computation of Basic and Diluted Earnings Per Share
The computation of basic and diluted earnings per share for each of the past three fiscal years is as follows:
 
(In thousands, except per share amounts)
Net Income
 
Shares
 
Per Share
Amount
Fiscal 2014
 
 
 
 
 
Basic earnings per share
$
340,822

 
64,240

 
$
5.31

Effect of dilutive securities:
 
 
 
 
 
Stock options
—

 
239

 
(0.01
)
Restricted stock
—

 
595

 
(0.06
)
Diluted earnings per share
$
340,822

 
65,074

 
$
5.24

Fiscal 2013
 
 
 
 
 
Basic earnings per share
$
350,224

 
65,073

 
$
5.38

Effect of dilutive securities:
 
 
 
 
 
Stock options
—

 
354

 
(0.03
)
Restricted stock
—

 
418

 
(0.03
)
Diluted earnings per share
$
350,224

 
65,845

 
$
5.32

Fiscal 2012
 
 
 
 
 
Basic earnings per share
$
272,171

 
65,267

 
$
4.17

Effect of dilutive securities:
 
 
 
 
 
Stock options
—

 
255

 
(0.01
)
Restricted stock
—

 
259

 
(0.02
)
Diluted earnings per share
$
272,171

 
65,781

 
$
4.14
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Revenues from individual customers that are 10% or more of our total revenues as follows: 
(In thousands)
Fiscal 2014
 
Fiscal 2013
 
Fiscal 2012
Apache Energy Ltd.
$
209,871

 
$
159,369

 
$
—

Shell Offshore Inc.
179,763

 
28,349

 
—

Chevron Australia Pty. Ltd.
175,334

 
197,242

 
265,731

Hess Corporation
—

 
154,973

 
—

Noble Energy Inc.
169,851

 
153,615

 
137,135

Sarawak Shell Bhd.
—

 
—

 
44,405

Kosmos Energy Ghana Inc.
12,933

 
—

 
90,088
Schedule Of Accounts Receivable By Major Customers [Table Text Block]
In addition, we have certain customers that make up a significant portion of our Accounts Receivable at September 30, 2014, as indicated in the table below:
Customer
Percentage of Accounts Receivable
Apache Energy Ltd.
12%
Shell Offshore Inc.
10%
Chevron Australia Pty. Ltd.
14%
Noble Energy Inc.
14%