Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Operating Activities
Net Income Attributable to Kadant	$ 28,659us-gaap_NetIncomeLoss	$ 23,419us-gaap_NetIncomeLoss	$ 31,623us-gaap_NetIncomeLoss
Net income attributable to noncontrolling interest	389	229	198
Loss (income) from discontinued operation	23	62	(743)
Income from continuing operations	29,071	23,710	31,078
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	11,189	9,775	8,384
Stock-based compensation expense	5,813us-gaap_ShareBasedCompensation	5,216us-gaap_ShareBasedCompensation	4,766us-gaap_ShareBasedCompensation
Gain on sale of property, plant and equipment	(118)	(2,012)	(214)
Provision (benefit) for losses on accounts receivable	246us-gaap_ProvisionForDoubtfulAccounts	374us-gaap_ProvisionForDoubtfulAccounts	(14)us-gaap_ProvisionForDoubtfulAccounts
Deferred income tax provision (benefit)	2,951us-gaap_DeferredIncomeTaxExpenseBenefit	(1,061)us-gaap_DeferredIncomeTaxExpenseBenefit	(4,868)us-gaap_DeferredIncomeTaxExpenseBenefit
Other items, net	547	1,485	1,107
Contributions to pension plan	(1,080)us-gaap_PensionContributions	(1,080)us-gaap_PensionContributions	(960)us-gaap_PensionContributions
Changes in current assets and liabilities, net of effects of acquisitions:
Accounts receivable	8,429	(2,197)	1,157
Unbilled contract costs and fees	(2,277)	(840)	236
Inventories	5,067us-gaap_IncreaseDecreaseInInventories	(2,005)us-gaap_IncreaseDecreaseInInventories	9,156us-gaap_IncreaseDecreaseInInventories
Other current assets	(563)	113	(696)
Accounts payable	652	2,552	(5,868)
Other current liabilities	(11,060)	5,905	(12,808)
Net cash provided by continuing operations	48,867	39,935	30,456
Net cash provided by (used in) discontinued operation	5	141	(1,348)
Net cash provided by operating activities	48,872	40,076	29,108
Investing Activities
Acquisitions, net of cash acquired	(11,984)	(65,594)	85
Purchases of property, plant, and equipment	(6,755)	(6,261)	(4,250)
Proceeds from sale of property, plant, and equipment	242	3,459	803
Dividend paid to noncontrolling interest	0kai_DividendPaidToMinorityShareholder	(731)kai_DividendPaidToMinorityShareholder	0kai_DividendPaidToMinorityShareholder
Other, net	0	971	(3)
Net cash used in continuing operations for investing activities	(18,497)	(68,156)	(3,365)
Financing Activities
Proceeds from issuance of short- and long-term obligations	24,512us-gaap_ProceedsFromIssuanceOfDebt	53,609us-gaap_ProceedsFromIssuanceOfDebt	5,000us-gaap_ProceedsFromIssuanceOfDebt
Repayments of short- and long-term obligations	(36,953)us-gaap_RepaymentsOfDebt	(21,849)us-gaap_RepaymentsOfDebt	(10,375)us-gaap_RepaymentsOfDebt
Purchases of Company common stock	(15,136)	(5,367)	(14,491)
Dividends paid	(6,339)us-gaap_PaymentsOfDividendsCommonStock	(4,189)us-gaap_PaymentsOfDividendsCommonStock	0us-gaap_PaymentsOfDividendsCommonStock
Change in restricted cash	(299)kai_ChangeInRestrictedCash	(168)kai_ChangeInRestrictedCash	700kai_ChangeInRestrictedCash
Payment of debt issuance costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(154)us-gaap_PaymentsOfDebtIssuanceCosts	(644)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from issuance of Company common stock	1,119	337	358
Excess tax benefits from stock-based compensation awards	771	351	132
Net cash (used in) provided by continuing operations for financing activities	(32,325)	22,570	(19,320)
Exchange Rate Effect on Cash and Cash Equivalents from Continuing Operations	(2,704)	989	1,180
(Decrease) Increase in Cash and Cash Equivalents from Continuing Operations	(4,654)	(4,521)	7,603
Cash and Cash Equivalents at Beginning of Year	50,032	54,553	46,950
Cash and Cash Equivalents at End of Year	$ 45,378	$ 50,032	$ 54,553

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The effect of exchange rate changes on cash balances in continuing operations held in foreign currencies.

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The increase (decrease) during the reporting period in other current operating assets not separately disclosed in the statement of cash flows.

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The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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