XML 58 R43.htm IDEA: XBRL DOCUMENT v3.7.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NEW ACCOUNTING STANDARD (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Income Statement [Abstract]          
Income tax provision $ 23,932 $ 17,815 $ 25,950 $ 24,537  
Net income $ 114,702 $ 73,353 $ 149,631 $ 123,635  
EARNINGS PER COMMON SHARE          
Basic (usd per share) $ 1.33 $ 0.85 $ 1.74 $ 1.44  
Diluted (usd per share) $ 1.32 $ 0.84 $ 1.72 $ 1.42  
Cash flows (used in) operating activities          
Net income, as reported $ 114,702 $ 73,353 $ 149,631 $ 123,635  
Tax benefit from stock-based compensation     1,231 1,660  
Other noncurrent liabilities     (2,997) 2,163  
Net cash flows (used in) operating activities     171,804 118,005  
Cash flows from financing activities          
Tax withholding payments related to net settled stock compensation     (4,354) (3,181)  
Cash flows from financing activities     39,251 50,366  
Assets          
Other noncurrent assets 61,052   61,052   $ 60,196
Total noncurrent assets 683,098   683,098   703,654
Total assets 3,857,359   3,857,359   3,718,570
Capitalization and Liabilities          
Long-term debt 1,023,968   1,023,968   1,055,038
Total capitalization 2,310,248   2,310,248   2,221,629
Total capitalization and liabilities $ 3,857,359   $ 3,857,359   3,718,570
As Previously Reported          
Income Statement [Abstract]          
Income tax provision   17,840   26,197  
Net income   $ 73,328   $ 121,975  
EARNINGS PER COMMON SHARE          
Basic (usd per share)   $ 0.85   $ 1.42  
Diluted (usd per share)   $ 0.84   $ 1.41  
Cash flows (used in) operating activities          
Net income, as reported   $ 73,328   $ 121,975  
Tax benefit from stock-based compensation       0  
Other noncurrent liabilities       2,302  
Net cash flows (used in) operating activities       114,824  
Cash flows from financing activities          
Tax withholding payments related to net settled stock compensation       0  
Cash flows from financing activities       53,547  
Assets          
Other noncurrent assets         68,708
Total noncurrent assets         712,166
Total assets         3,727,082
Capitalization and Liabilities          
Long-term debt         1,063,550
Total capitalization         2,230,141
Total capitalization and liabilities         3,727,082
Effect of Change          
Income Statement [Abstract]          
Income tax provision   (25)   (1,660)  
Net income   $ 25   $ 1,660  
EARNINGS PER COMMON SHARE          
Basic (usd per share)   $ 0.00   $ 0.02  
Diluted (usd per share)   $ 0.00   $ 0.01  
Cash flows (used in) operating activities          
Net income, as reported   $ 25   $ 1,660  
Tax benefit from stock-based compensation       1,660  
Other noncurrent liabilities       (139)  
Net cash flows (used in) operating activities       3,181  
Cash flows from financing activities          
Tax withholding payments related to net settled stock compensation       (3,181)  
Cash flows from financing activities       $ (3,181)  
Assets          
Other noncurrent assets         (8,512)
Total noncurrent assets         (8,512)
Total assets         (8,512)
Capitalization and Liabilities          
Long-term debt         (8,512)
Total capitalization         (8,512)
Total capitalization and liabilities         $ (8,512)