Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2011

Summary Of Significant Accounting Policies

Estimated Useful Lives Of Assets

	Years
Drilling vessels and related equipment Drill pipe Furniture and other		5-35 3 3-10

Computation Of Basic And Diluted Earnings Per Share

	Net Income		Shares		Per Share Amount
Fiscal 2011:
Basic earnings per share	$	271,674		64,754	$	4.20
Effect of dilutive securities—
Stock options		—		649		(0.05	)
Diluted earnings per share	$	271,674		65,403	$	4.15
Fiscal 2010:
Basic earnings per share	$	256,996		64,391	$	3.99
Effect of dilutive securities—
Stock options		—		637		(0.04	)
Diluted earnings per share	$	256,996		65,028	$	3.95
Fiscal 2009:
Basic earnings per share	$	250,745		64,167	$	3.91
Effect of dilutive securities—
Stock options		—		326		(0.02	)
Diluted earnings per share	$	250,745		64,493	$	3.89