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GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Cash Flows (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash (used in) provided by operating activities $ 409,018 $ 207,651
Cash flows from investing activities:    
Capital expenditures (329,980) (191,202)
Purchase of short-term investments (42,406) (36,784)
Payment for acquisition of business, net of cash acquired (2,781) (47,886)
Proceeds from sale of short-term investments 58,015 32,020
Proceeds from asset sales 24,559 17,826
Net cash used in investing activities (292,593) (226,026)
Cash flows from financing activities:    
Debt issuance costs paid (3,912)  
Dividends paid (156,580) (153,433)
Payments for employee taxes on net settlement of equity awards (6,268) (5,791)
Proceeds from stock option exercises 2,257 1,645
Payment of contingent consideration from acquisition of business   (4,500)
Net cash used in financing activities (164,503) (162,079)
Net decrease in cash and cash equivalents and restricted cash (48,078) (180,454)
Cash and cash equivalents and restricted cash, beginning of period 326,185 560,509
Cash and cash equivalents and restricted cash, end of period 278,107 380,055
Guarantor/Parent | Reportable Legal Entities    
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash (used in) provided by operating activities 1,888 10,351
Cash flows from investing activities:    
Capital expenditures (5,178) (4,661)
Payment for acquisition of business, net of cash acquired (2,781) (47,886)
Intercompany transfers 7,957 52,547
Net cash used in investing activities (2)  
Cash flows from financing activities:    
Debt issuance costs paid (3,912)  
Intercompany transfers 156,580 153,433
Dividends paid (156,580) (153,433)
Payments for employee taxes on net settlement of equity awards (6,268) (5,791)
Proceeds from stock option exercises 2,257 1,645
Net cash used in financing activities (7,923) (4,146)
Net decrease in cash and cash equivalents and restricted cash (6,037) 6,205
Cash and cash equivalents and restricted cash, beginning of period 6,037 9,385
Cash and cash equivalents and restricted cash, end of period   15,590
Issuer Subsidiary | Reportable Legal Entities    
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash (used in) provided by operating activities 402,102 192,093
Cash flows from investing activities:    
Capital expenditures (320,577) (181,218)
Purchase of short-term investments (40,729) (36,784)
Proceeds from sale of short-term investments 58,015 32,020
Intercompany transfers (7,957) (52,547)
Proceeds from asset sales 20,971 16,308
Net cash used in investing activities (290,277) (222,221)
Cash flows from financing activities:    
Intercompany transfers (156,580) (153,433)
Net cash used in financing activities (156,580) (153,433)
Net decrease in cash and cash equivalents and restricted cash (44,755) (183,561)
Cash and cash equivalents and restricted cash, beginning of period 273,214 507,504
Cash and cash equivalents and restricted cash, end of period 228,459 323,943
Non-Guarantor Subsidiaries | Reportable Legal Entities    
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash (used in) provided by operating activities 5,028 5,207
Cash flows from investing activities:    
Capital expenditures (4,225) (5,323)
Purchase of short-term investments (1,677)  
Proceeds from asset sales 3,588 1,518
Net cash used in investing activities (2,314) (3,805)
Cash flows from financing activities:    
Payment of contingent consideration from acquisition of business   (4,500)
Net cash used in financing activities   (4,500)
Net decrease in cash and cash equivalents and restricted cash 2,714 (3,098)
Cash and cash equivalents and restricted cash, beginning of period 46,934 43,620
Cash and cash equivalents and restricted cash, end of period $ 49,648 $ 40,522