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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES      
Net Cash Provided by (Used in) Operating Activities $ 350,284 $ 337,665 $ 331,598
CASH FLOWS FROM INVESTING ACTIVITIES      
Additions to Property, Plant, and Equipment (168,873) (131,957) (56,938)
Proceeds from Sales of Property, Plant, and Equipment 2,281    
Acquisition Spending   (36,761) (400,488)
Net Cash Used in Investing Activities (166,592) (168,718) (457,426)
CASH FLOWS FROM FINANCING ACTIVITIES      
Increase (Decrease) in Credit Facility 70,000 15,000 (157,000)
Repayment of Private Placement Senior Unsecured Notes   (81,214) (8,000)
Issuance of Senior Unsecured Notes     350,000
Payment of Debt Issuance Costs     (6,637)
Dividends Paid to Stockholders (18,927) (19,438) (19,341)
Purchase and Retirement of Common Stock (271,988) (61,078) (60,013)
Proceeds from Stock Option Exercises 2,103 24,264 22,108
Shares Redeemed to Settle Employee Taxes on Stock Compensation (4,347) (4,974) (4,468)
Excess Tax Benefits from Share Based Payment Arrangements     10,349
Net Cash Provided by (Used in) Financing Activities (223,159) (127,440) 126,998
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (39,467) 41,507 1,170
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD 48,068 6,561 5,391
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD 8,601 48,068 6,561
Eliminations [Member]      
CASH FLOWS FROM INVESTING ACTIVITIES      
Investment in Subsidiaries   36,761 400,488
Net Cash Used in Investing Activities   36,761 400,488
CASH FLOWS FROM FINANCING ACTIVITIES      
Intra-entity Activity, net   (36,761) (400,488)
Net Cash Provided by (Used in) Financing Activities   (36,761) (400,488)
Parent [Member] | Reportable Legal Entities [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net Cash Provided by (Used in) Operating Activities 33,997 (83,947) (64,376)
CASH FLOWS FROM INVESTING ACTIVITIES      
Additions to Property, Plant, and Equipment (6,107) (142) (697)
Investment in Subsidiaries   (36,761) (400,488)
Net Cash Used in Investing Activities (6,107) (36,903) (401,185)
CASH FLOWS FROM FINANCING ACTIVITIES      
Increase (Decrease) in Credit Facility 70,000 15,000 (157,000)
Repayment of Private Placement Senior Unsecured Notes   (81,214) (8,000)
Issuance of Senior Unsecured Notes     350,000
Payment of Debt Issuance Costs     (6,637)
Dividends Paid to Stockholders (18,927) (19,438) (19,341)
Purchase and Retirement of Common Stock (271,988) (61,078) (60,013)
Proceeds from Stock Option Exercises 2,103 24,264 22,108
Shares Redeemed to Settle Employee Taxes on Stock Compensation (4,347) (4,974) (4,468)
Excess Tax Benefits from Share Based Payment Arrangements     10,349
Intra-entity Activity, net 156,511 287,643 340,240
Net Cash Provided by (Used in) Financing Activities (66,648) 160,203 467,238
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (38,758) 39,353 1,677
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD 44,537 5,184 3,507
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD 5,779 44,537 5,184
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net Cash Provided by (Used in) Operating Activities 316,287 421,612 395,974
CASH FLOWS FROM INVESTING ACTIVITIES      
Additions to Property, Plant, and Equipment (162,766) (131,815) (56,241)
Proceeds from Sales of Property, Plant, and Equipment 2,281    
Acquisition Spending   (36,761) (400,488)
Net Cash Used in Investing Activities (160,485) (168,576) (456,729)
CASH FLOWS FROM FINANCING ACTIVITIES      
Intra-entity Activity, net (156,511) (250,882) 60,248
Net Cash Provided by (Used in) Financing Activities (156,511) (250,882) 60,248
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (709) 2,154 (507)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD 3,531 1,377 1,884
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD $ 2,822 $ 3,531 $ 1,377