| Component: (Network and Table) | |
|---|---|
| Network | 00500 - Statement - Consolidated Statements of Cash Flows (http://www.hpinc.com/role/StatementConsolidatedStatementsOfCashFlows)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0000046765 (http://www.sec.gov/CIK) | 
| Consolidated Statements of Cash Flows | Period [Axis] | ||
|---|---|---|---|
2015-10-01 - 2016-09-30  | 2014-10-01 - 2015-09-30  | 2013-10-01 - 2014-09-30  | |
Consolidated Statements of Cash Flows  | |||
OPERATING ACTIVITIES:  | |||
Net income (loss)  | (56,828,000)   | 420,427,000    | 706,563,000    | 
Adjustment for loss from discontinued operations  | 3,838,000    | 47,000    | 47,000    | 
Income (loss) from continuing operations  | (52,990,000)   | 420,474,000    | 706,610,000    | 
Adjustments to reconcile net income (loss) to net cash provided by operating activities:  | |||
Depreciation  | 598,587,000    | 608,039,000    | 523,984,000    | 
Asset impairment charge  | 6,250,000    | 39,242,000    | |
Amortization of debt issuance costs  | |||
Provision for (recovery of) bad debt  | (  | (  | |
Stock-based compensation  | |||
Pension settlement charges  | |||
(Gain) loss on investment securities  | 25,989,000    | (45,234,000)   | |
Income from asset sales  | (9,896,000)   | (11,834,000)   | (19,083,000)   | 
Deferred income tax expense  | |||
Other  | (  | ||
Change in assets and liabilities:  | |||
Accounts receivable  | (  | ||
Inventories  | (  | (  | |
Prepaid expenses and other  | (  | (  | (  | 
Accounts payable  | (  | (  | (  | 
Accrued liabilities  | (  | ||
Deferred income taxes  | (  | ||
Other noncurrent liabilities  | (  | (  | |
Net cash provided by operating activities from continuing operations  | |||
Net cash provided by (used in) operating activities from discontinued operations  | (  | (  | |
Net cash provided by operating activities  | |||
INVESTING ACTIVITIES:  | |||
Capital expenditures  | (  | (  | (  | 
Purchase of short-term investments  | (  | (  | |
Proceeds from sale of short-term investments  | |||
Proceeds from asset sales  | |||
Proceeds from sale of investments  | |||
Net cash used in investing activities  | (  | (  | (  | 
FINANCING ACTIVITIES:  | |||
Payments on long-term debt  | (  | (  | (  | 
Proceeds from senior notes, net of discount  | |||
Debt issuance costs  | (  | (  | |
Proceeds on short-term debt  | |||
Payments on short-term debt  | (  | ||
Repurchase of common stock  | (  | ||
Dividends paid  | (  | (  | (  | 
Exercise of stock options, net of tax withholding  | |||
Tax withholdings related to net share settlements of restricted stock  | (  | (  | (  | 
Excess tax benefit from stock-based compensation  | |||
Net cash provided by (used in) financing activities  | (  | (  | |
Net increase (decrease) in cash and cash equivalents  | (  | ||
Cash and cash equivalents, beginning of period  | 729,384,000    | ||
Cash and cash equivalents, end of period  | 905,561,000    | 729,384,000    | 360,307,000    |