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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating activities:    
Net earnings $ 104,524 $ 84,255
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 86,819 82,164
Provision (benefit) for deferred income taxes 1,287 (10,215)
Gain on asset dispositions, net (6,533) (2,189)
Equity in earnings of unconsolidated companies, less dividends (6,875) (6,167)
Compensation expense - stock-based 11,075 10,999
Excess tax benefit on stock options exercised   (341)
Changes in assets and liabilities, net:    
Trade and other receivables (24,258) 776
Changes in due to/from affiliate, net 62,555 (131,974)
Marine operating supplies (6,139) 9,363
Other current assets (4,052) (10,666)
Accounts payable (15,652) (3,893)
Accrued expenses (13,358) (10,390)
Accrued property and liability losses (393) 39
Other current liabilities 450 276
Other liabilities and deferred credits (1,245) (531)
Other, net (2,916) (1,678)
Net cash provided by operating activities 185,289 9,828
Cash flows from investing activities:    
Proceeds from sales of assets 3,999 7,646
Proceeds from sale/leaseback of assets 32,751 65,550
Additions to properties and equipment (128,411) (220,309)
Payments for acquisition, net of cash acquired   (127,737)
Other (13) (687)
Net cash used in investing activities (91,674) (275,537)
Cash flows from financing activities:    
Debt issuance costs   (3,845)
Principal payment on long-term debt (25,996) (691,615)
Debt borrowings 20,000 986,262
Proceeds from exercise of stock options 1,025 4,421
Cash dividends (25,038) (24,890)
Excess tax benefit on stock options exercised   341
Other 350  
Net cash (used in) provided by financing activities (29,659) 270,674
Net change in cash and cash equivalents 63,956 4,965
Cash and cash equivalents at beginning of period 60,359 40,569
Cash and cash equivalents at end of period 124,315 45,534
Cash paid during the period for:    
Interest, net of amounts capitalized 26,328 23,338
Income taxes 32,414 32,144
Supplemental disclosure of non-cash investing activities:    
Additions to properties and equipment 3,845 4,157
Increase in receivables due to sale of shipyard   $ 6,500