Accumulated other comprehensive loss Accumulated other comprehensive loss Less accumulated depreciation and amortization Less accumulated depreciation and amortization Additional paid-in capital Additional paid-in capital Capital expenditures Capital expenditures Cash and cash equivalents Cash and cash equivalents CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS, END OF PERIOD Billings in excess of costs and estimated profits on uncompleted contracts Increase (Decrease) in Billing in Excess of Cost of Earnings Accrued income taxes Income taxes payable Inventories Inventories Other current liabilities Increase (Decrease) in Other Accrued Liabilities Prepaid expenses and other current assets Increase (Decrease) in Prepaid, Deferred Expense and Other Assets Accounts payable Accounts payable Common stock, authorized shares Common stock, shares authorized Common Stock Common Stock Construction in progress Construction in progress CURRENT LIABILITIES: CURRENT LIABILITIES: Total current liabilities Total current liabilities Deferred income taxes Deferred income taxes Deferred revenues Deferred revenues Note 5 - Cash and Cash Equivalents Cash And Cash Equivalents Disclosure [Text Block] Net income - diluted Net income - diluted Stock-based compensation expense Stock-based compensation expense Gain on disposals of property and equipment Gain on disposals of property and equipment Gain on disposals of property and equipment INCOME TAXES Interest expense Interest expense Work-in-progress Inventories - work-in-progress TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Note 6 - Construction Contracts in Process Construction Projects in Process Current maturities of long-term debt Current maturities of long-term debt Long-term debt - less current maturities Long-term debt - less current maturities Net cash used in financing activities: Cash provided by (used in) financing activities: Net cash used in financing activities Net cash used in financing activities Net cash used in investing activities: Cash provided by (used in) investing activities: Net cash used in investing activities Net cash used in investing activities Adjustments to reconcile net income to net cash provided by operations: Adjustments to reconcile net income to net cash provided by operations: Net cash (used in) provided by operations Net cash provided by operations NET INCOME Net Income NET INCOME Net income DECREASE IN CASH AND CASH EQUIVALENTS INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Other income - net Total other income (expense) - net INCOME FROM OPERATIONS INCOME FROM OPERATIONS REVENUES: REVENUES: Total revenues Total (Revenues) Note 1 - General NATURE OF OPERATIONS AND BASIS OF PRESENTATION Net changes in other noncurrent assets and liabilities Net changes in other noncurrent assets and liabilities Other - net Other - net Postretirement benefit claims paid Postretirement benefit claims paid Payment of cash dividends Payment of cash dividends Contributions to pension plans Contributions to pension plans Note 4 - Pension and Other Postretirement Benefits PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Preferred stock, shares authorized Preferred stock, shares authorized Preferred stock, shares issued Preferred stock, shares issued Proceeds from disposals of property, plant and equipment Proceeds from disposals of property, plant and equipment Total (Property, Plant and Equipment) Property, plant and equipment - gross PROPERTY, PLANT AND EQUIPMENT - at cost: PROPERTY, PLANT AND EQUIPMENT - at cost: Property, plant and equipment - net Property, plant and equipment - net Retained earnings Retained earnings Drilling services Drilling services SUBSEQUENT EVENTS Note 11 - Subsequent Events Note 2 - Segment Information SEGMENT INFORMATION Selling, general and administrative Selling, general and administrative STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY CURRENT ASSETS: CURRENT ASSETS: Total current assets Total current assets Total Assets TOTAL ASSETS Interest income Interest income Other current liabilities Other current liabilities Other liabilities Other liabilities Deferred tax assets - net Deferred tax assets - net Deferred income taxes - net Deferred income taxes - net Finished goods Inventories - finished goods Cost of treasury shares Cost of treasury shares Billings in excess of costs and estimated profits on uncompleted contracts Billings in excess of costs and estimated profits on uncompleted contracts Net income - basic Net income - basic Excess tax benefits from stock-based compensation Excess tax benefits from stock-based compensation Preferred stock, par value Preferred stock, par value per share Common stock, issued shares Common stock, shares issued Deferred revenues Increase (Decrease) in Deferred Revenue Other assets Other assets Preferred stock, shares outstanding Preferred stock, shares outstanding INCOME BEFORE INCOME TAXES Income before Income Taxes Common stock, par value Common stock, par value per share Treasury shares Treasury shares Total stockholders' equity Total stockholders' equity Balance at beginning of year Balance Provision for income taxes Provision for income taxes Provision for pension and postretirement benefits Provision for pension and postretirement benefits Interest capitalized Less interest capitalized Preferred stock Preferred stock Other property and equipment Other property and equipment Change in restricted cash balance Change in restricted cash balance COSTS AND EXPENSES: COSTS AND EXPENSES: Total costs and expenses Total (Costs and Expenses) Earnings Per Share [Text Block] Note 3 - Earnings Per Share Accrued income taxes Depreciation and amortization Depreciation, depletion and amortization Accrued compensation and related employee costs Accrued compensation and related employee costs Proceeds from stock option and convertible debenture plans and other Proceeds from stock option plans and other Commitments and contingent liabilities Commitments and contingent liabilities (Notes 7 and 8) Accounts payable - trade Accounts payable - trade Receivables - trade and other Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collectio; and Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy. Receivables - trade and other Raw materials and supplies Carrying amount as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process. Also includes purchased parts that will be used as components of a finished product; and Carrying amount as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods. Inventories - raw materials and supplies Prepaid expenses and other current assets Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer and Aggregate carrying amount, as of the balance sheet date, of current assets not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer). Prepaid expenses and other current assets Drilling equipment Machinery and Equipment, Drilling Services, Gross Drilling equipment Manufacturing plant and equipment Property, Plant and Equipment, Manufacturing Operations, Gross Manufacturing plant and equipment Aggregate revenue recognized during the period derived from manufacturing goods sold and services rendered. Manufacturing sales and services Manufacturing sales and services The aggregate costs related to drilling services rendered during the reporting period. This excludes costs incurred during the reporting period related to depreciation, allocated general and administrative expenses, gains and losses on equipment sales, and other certain material charges and credits attributable to drilling services. Drilling operations Drilling services (excluding items below) Manufacturing operations (excluding items shown below) Manufacturing sales and services (excluding items below) The aggregate costs related to manufacturing sales and services rendered during the reporting period. This excludes costs incurred during the reporting period related to depreciation, allocated general and administrative expenses, gains and losses on equipment sales, and other certain material charges and credits attributable to manufacturing activities. Depreciation And Amortization For Current Period Depreciation and amortization Aggregate depreciation, depletion and amortization expense in the current period for the cost of tangible assets, intangible assets, or depleting assets directly related to goods produced and sold during the reporting period and Aggregate depreciation, depletion and amortization expense in the current period for the cost of tangible assets, intangible assets, or depleting assets directly related to goods produced and sold during the reporting period. The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer and The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Repayments of borrowings Repayments of borrowings Class of Stock for Rowan Companies [Axis] Class of Stock for Rowan Companies [Domain] Other Income [Abstract] OTHER INCOME (EXPENSE): Earnings Per Share Basic and Diluted [Abstract] PER SHARE AMOUNTS: Changes in current assets and liabilities: Changes in current assets and liabilities: Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collectio; and Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy. Receivables Trade and Other as Presented in the Statement of Cash Flows Receivables - trade and other Notes to Financial Statements [Abstract] Series A Junior Preferred Stock [Member] Series C Preferred Stock [Member] Statement [Line Items] Statement [Table] Document Type Document Period End Date Amendment Flag Amendment Description Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Income Statement [Abstract] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] LONG-TERM DEBT Proceeds From Borrowings Net Of Issue Costs Proceeds from borrowings, net of issue costs The net cash inflow in aggregate debt due to proceeds from additional borrowings, net of the cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated debt. Income Tax Credits And Adjustments Estimated net benefits from income tax claims Material charge - manufacturing inventories (Note 10) Document Information [Text Block] Entity [Text Block] Goodwill impairment Proceeds from huricane-related event Payments to acquire treasury stock Accrued liabilities SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES ACCRUED LIABILITIES COMMITMENTS AND CONTINGENT LIABILITIES Note 7 - Commitments STOCKHOLDERS' EQUITY Stockholders Equity Note Disclosure [Text Block] FINANCIAL INSTRUMENTS Note 10 - Other Financial Statement Disclosures - Fair Value Disclosures MATERIAL CHARGES AND OTHER OPERATING EXPENSES Other Income and Other Expense Disclosure [Text Block] RELATED PARTY TRANSACTIONS Note 10 - Other Financial Statement Disclosures - Cash Flow, Supplemental Information Stock-based incentive plans Gain on hurricane-related event Schedule of Loss Contingencies By Contingency [Text Block] Note 8 - Legal Proceedings Disclosure of Compensation Related Costs Share Based Payments [Text Block] Note 9 - Stock-Based Compensation Note 10 - Other Financial Statement Disclosures - Comprehensive Income Document Fiscal Year Focus Document Fiscal Period Focus Accrued interest Note 10 - Other Financial Statement Disclosures - Material Operating Charges