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Guarantor and Non-Guarantor Financial Information - Cash Flows (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities $ 236,134 $ 615,410
INVESTING ACTIVITIES:    
Capital expenditures (300,275) (219,549)
Purchase of short-term investments (48,958) (36,958)
Payment for acquisition of business, net of cash acquired (70,416)  
Proceeds from sale of short-term investments 53,150 32,681
Proceeds from asset sales 17,921 12,804
Net cash used in investing activities (348,578) (211,022)
FINANCING ACTIVITIES:    
Debt issuance costs   (32)
Dividends paid (229,061) (224,040)
Exercise of stock options, net of tax withholding 10,458 483
Tax withholdings related to net share settlements of restricted stock (5,848) (3,912)
Excess tax benefit from stock-based compensation 4,121 761
Net cash used in financing activities (220,330) (226,740)
Net increase (decrease) in cash and cash equivalents (332,774) 177,648
Cash and cash equivalents, beginning of period 905,561 729,384
Cash and cash equivalents, end of period 572,787 907,032
Guarantor/Parent | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities (4,457) 4,127
INVESTING ACTIVITIES:    
Capital expenditures (2,344) (15,515)
Intercompany transfers 72,760 15,515
Payment for acquisition of business, net of cash acquired (70,416)  
Proceeds from asset sales   8
Net cash used in investing activities   8
FINANCING ACTIVITIES:    
Intercompany transfers 229,061 224,040
Dividends paid (229,061) (224,040)
Exercise of stock options, net of tax withholding 10,458 483
Tax withholdings related to net share settlements of restricted stock (5,848) (3,912)
Excess tax benefit from stock-based compensation (339) (788)
Net cash used in financing activities 4,271 (4,217)
Net increase (decrease) in cash and cash equivalents (186) (82)
Cash and cash equivalents, beginning of period (955) (838)
Cash and cash equivalents, end of period (1,141) (920)
Issuer Subsidiary | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities 231,133 631,371
INVESTING ACTIVITIES:    
Capital expenditures (293,946) (200,611)
Intercompany transfers (72,760) (15,515)
Purchase of short-term investments (48,958) (36,958)
Proceeds from sale of short-term investments 53,150 32,681
Proceeds from asset sales 17,316 10,956
Net cash used in investing activities (345,198) (209,447)
FINANCING ACTIVITIES:    
Debt issuance costs   (32)
Intercompany transfers (229,061) (224,040)
Excess tax benefit from stock-based compensation 4,043 1,351
Net cash used in financing activities (225,018) (222,721)
Net increase (decrease) in cash and cash equivalents (339,083) 199,203
Cash and cash equivalents, beginning of period 899,028 693,273
Cash and cash equivalents, end of period 559,945 892,476
Non-Guarantor Subsidiaries | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities 9,458 (20,088)
INVESTING ACTIVITIES:    
Capital expenditures (3,985) (3,423)
Proceeds from asset sales 605 1,840
Net cash used in investing activities (3,380) (1,583)
FINANCING ACTIVITIES:    
Excess tax benefit from stock-based compensation 417 198
Net cash used in financing activities 417 198
Net increase (decrease) in cash and cash equivalents 6,495 (21,473)
Cash and cash equivalents, beginning of period 7,488 36,949
Cash and cash equivalents, end of period $ 13,983 $ 15,476