3.4.0.3 html 71 202 1 false 26 0 false 7 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.kapstonepaper.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - Consolidated Balance Sheets Sheet http://www.kapstonepaper.com/role/StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 00105 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.kapstonepaper.com/role/StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.kapstonepaper.com/role/StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 4 false false R5.htm 00300 - Statement - Consolidated Statements of Cash Flows Sheet http://www.kapstonepaper.com/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 10101 - Disclosure - Financial Statements Sheet http://www.kapstonepaper.com/role/DisclosureFinancialStatements Financial Statements Notes 6 false false R7.htm 10201 - Disclosure - Recent Accounting Pronouncements Sheet http://www.kapstonepaper.com/role/DisclosureRecentAccountingPronouncements Recent Accounting Pronouncements Notes 7 false false R8.htm 10301 - Disclosure - Planned Maintenance Outages Sheet http://www.kapstonepaper.com/role/DisclosurePlannedMaintenanceOutages Planned Maintenance Outages Notes 8 false false R9.htm 10401 - Disclosure - Inventories Sheet http://www.kapstonepaper.com/role/DisclosureInventories Inventories Notes 9 false false R10.htm 10501 - Disclosure - Short-term Borrowings and Long-term Debt Sheet http://www.kapstonepaper.com/role/DisclosureShortTermBorrowingsAndLongTermDebt Short-term Borrowings and Long-term Debt Notes 10 false false R11.htm 10601 - Disclosure - Income Taxes Sheet http://www.kapstonepaper.com/role/DisclosureIncomeTaxes Income Taxes Notes 11 false false R12.htm 10701 - Disclosure - Net Income per Share Sheet http://www.kapstonepaper.com/role/DisclosureNetIncomePerShare Net Income per Share Notes 12 false false R13.htm 10801 - Disclosure - Pension Plan and Post-Retirement Benefits Sheet http://www.kapstonepaper.com/role/DisclosurePensionPlanAndPostRetirementBenefits Pension Plan and Post-Retirement Benefits Notes 13 false false R14.htm 10901 - Disclosure - Stock-Based Compensation Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensation Stock-Based Compensation Notes 14 false false R15.htm 11001 - Disclosure - Commitments and Contingencies Sheet http://www.kapstonepaper.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 15 false false R16.htm 11101 - Disclosure - Segment Information Sheet http://www.kapstonepaper.com/role/DisclosureSegmentInformation Segment Information Notes 16 false false R17.htm 11201 - Disclosure - Subsequent Event Sheet http://www.kapstonepaper.com/role/DisclosureSubsequentEvent Subsequent Event Notes 17 false false R18.htm 30403 - Disclosure - Inventories (Tables) Sheet http://www.kapstonepaper.com/role/DisclosureInventoriesTables Inventories (Tables) Tables http://www.kapstonepaper.com/role/DisclosureInventories 18 false false R19.htm 30703 - Disclosure - Net Income per Share (Tables) Sheet http://www.kapstonepaper.com/role/DisclosureNetIncomePerShareTables Net Income per Share (Tables) Tables http://www.kapstonepaper.com/role/DisclosureNetIncomePerShare 19 false false R20.htm 30803 - Disclosure - Pension Plan and Post-Retirement Benefits (Tables) Sheet http://www.kapstonepaper.com/role/DisclosurePensionPlanAndPostRetirementBenefitsTables Pension Plan and Post-Retirement Benefits (Tables) Tables http://www.kapstonepaper.com/role/DisclosurePensionPlanAndPostRetirementBenefits 20 false false R21.htm 30903 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.kapstonepaper.com/role/DisclosureStockBasedCompensation 21 false false R22.htm 31103 - Disclosure - Segment Information (Tables) Sheet http://www.kapstonepaper.com/role/DisclosureSegmentInformationTables Segment Information (Tables) Tables http://www.kapstonepaper.com/role/DisclosureSegmentInformation 22 false false R23.htm 40101 - Disclosure - Financial Statements (Details) Sheet http://www.kapstonepaper.com/role/DisclosureFinancialStatementsDetails Financial Statements (Details) Details http://www.kapstonepaper.com/role/DisclosureFinancialStatements 23 false false R24.htm 40301 - Disclosure - Planned Maintenance Outages (Details) Sheet http://www.kapstonepaper.com/role/DisclosurePlannedMaintenanceOutagesDetails Planned Maintenance Outages (Details) Details http://www.kapstonepaper.com/role/DisclosurePlannedMaintenanceOutages 24 false false R25.htm 40401 - Disclosure - Inventories (Details) Sheet http://www.kapstonepaper.com/role/DisclosureInventoriesDetails Inventories (Details) Details http://www.kapstonepaper.com/role/DisclosureInventoriesTables 25 false false R26.htm 40501 - Disclosure - Short-term Borrowings and Long-term Debt - Second Amended and Restated Credit Agreement, Interest Rates (Details) Sheet http://www.kapstonepaper.com/role/DisclosureShortTermBorrowingsAndLongTermDebtSecondAmendedAndRestatedCreditAgreementInterestRatesDetails Short-term Borrowings and Long-term Debt - Second Amended and Restated Credit Agreement, Interest Rates (Details) Details 26 false false R27.htm 40502 - Disclosure - Short-term Borrowings and Long-term Debt - Short-term Borrowings (Details) Sheet http://www.kapstonepaper.com/role/DisclosureShortTermBorrowingsAndLongTermDebtShortTermBorrowingsDetails Short-term Borrowings and Long-term Debt - Short-term Borrowings (Details) Details 27 false false R28.htm 40503 - Disclosure - Short-term Borrowings and Long-term Debt - Receivables Credit Facility (Details) Sheet http://www.kapstonepaper.com/role/DisclosureShortTermBorrowingsAndLongTermDebtReceivablesCreditFacilityDetails Short-term Borrowings and Long-term Debt - Receivables Credit Facility (Details) Details 28 false false R29.htm 40504 - Disclosure - Short-term Borrowings and Long-term Debt - Fair Value of Debt, Other Borrowing (Details) Sheet http://www.kapstonepaper.com/role/DisclosureShortTermBorrowingsAndLongTermDebtFairValueOfDebtOtherBorrowingDetails Short-term Borrowings and Long-term Debt - Fair Value of Debt, Other Borrowing (Details) Details 29 false false R30.htm 40601 - Disclosure - Income taxes (Details) Sheet http://www.kapstonepaper.com/role/DisclosureIncomeTaxesDetails Income taxes (Details) Details 30 false false R31.htm 40701 - Disclosure - Net income per share (Details) Sheet http://www.kapstonepaper.com/role/DisclosureNetIncomePerShareDetails Net income per share (Details) Details 31 false false R32.htm 40801 - Disclosure - Pension Plan and Post-Retirement Benefits (Details) Sheet http://www.kapstonepaper.com/role/DisclosurePensionPlanAndPostRetirementBenefitsDetails Pension Plan and Post-Retirement Benefits (Details) Details http://www.kapstonepaper.com/role/DisclosurePensionPlanAndPostRetirementBenefitsTables 32 false false R33.htm 40901 - Disclosure - Stock-Based Compensation (Details) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationDetails Stock-Based Compensation (Details) Details http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationTables 33 false false R34.htm 40902 - Disclosure - Stock-Based Compensation - Total Non Cash Stock Based Compensation Expense Related to Stock Options and Restricted Stock (Details) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationTotalNonCashStockBasedCompensationExpenseRelatedToStockOptionsAndRestrictedStockDetails Stock-Based Compensation - Total Non Cash Stock Based Compensation Expense Related to Stock Options and Restricted Stock (Details) Details 34 false false R35.htm 40903 - Disclosure - Stock-Based Compensation - Total Unrecognized Stock Based Compensation Cost Related to the Stock Options and Restricted Stock (Details) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationTotalUnrecognizedStockBasedCompensationCostRelatedToStockOptionsAndRestrictedStockDetails Stock-Based Compensation - Total Unrecognized Stock Based Compensation Cost Related to the Stock Options and Restricted Stock (Details) Details 35 false false R36.htm 40904 - Disclosure - Stock-Based Compensation - Stock Options (Details) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationStockOptionsDetails Stock-Based Compensation - Stock Options (Details) Details 36 false false R37.htm 40905 - Disclosure - Stock-Based Compensation - KapStone Stock Options Black-Scholes Assumptions (Details) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationKapstoneStockOptionsBlackScholesAssumptionsDetails Stock-Based Compensation - KapStone Stock Options Black-Scholes Assumptions (Details) Details 37 false false R38.htm 40906 - Disclosure - Stock-Based Compensation - Summary of Information Related to Stock Options (Details) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationSummaryOfInformationRelatedToStockOptionsDetails Stock-Based Compensation - Summary of Information Related to Stock Options (Details) Details 38 false false R39.htm 40907 - Disclosure - Stock-Based Compensation - Restricted Stock (Details) Sheet http://www.kapstonepaper.com/role/DisclosureStockBasedCompensationRestrictedStockDetails Stock-Based Compensation - Restricted Stock (Details) Details 39 false false R40.htm 41001 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.kapstonepaper.com/role/DisclosureCommitmentsAndContingenciesDetails Commitments and Contingencies (Details) Details http://www.kapstonepaper.com/role/DisclosureCommitmentsAndContingencies 40 false false R41.htm 41101 - Disclosure - Segment Information (Details) Sheet http://www.kapstonepaper.com/role/DisclosureSegmentInformationDetails Segment Information (Details) Details http://www.kapstonepaper.com/role/DisclosureSegmentInformationTables 41 false false R42.htm 41201 - Disclosure - Subsequent Event (Details) Sheet http://www.kapstonepaper.com/role/DisclosureSubsequentEventDetails Subsequent Event (Details) Details http://www.kapstonepaper.com/role/DisclosureSubsequentEvent 42 false false All Reports Book All Reports ks-20160331.xml ks-20160331.xsd ks-20160331_cal.xml ks-20160331_def.xml ks-20160331_lab.xml ks-20160331_pre.xml true true