Summary of Significant Accounting Policies	9 Months Ended
Jan. 03, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Business. Integrated Device Technology, Inc. (IDT or the Company) designs, develops, manufactures and markets a broad range of integrated circuits for the advanced communications, computing, consumer and automotive industries. Basis of Presentation. The Company's fiscal year is the 52 or 53 week period ending on the Sunday closest to March 31. In a 52 week year, each fiscal quarter consists of 13 weeks. In a 53 week year, the additional week is usually added to the third quarter, making such quarter consist of 14 weeks. The first and second quarters of fiscal 2016 and fiscal 2015 were 13 week periods, the third quarter of fiscal 2016 was 14 weeks, and the third quarter of fiscal 2015 was 13 weeks. On December 7, 2015, the Company completed its acquisition of Zentrum Mikroelektronik Dresden AG (ZMDI), a privately-held company mainly operating in Germany, for a purchase price of Euro-equivalent of $307.0 million. The unaudited condensed consolidated financial statements include the results of operations of ZMDI, commencing on the closing date of the acquisition. Principles of Consolidation. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated. Use of Estimates. The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Significant Accounting Policies. For a description of significant accounting policies, see Note 1, Summary of Significant Accounting Policies to the consolidated financial statements included in the Company's annual report on Form 10-K for the fiscal year ended March 29, 2015. There have been no material changes to the Company's significant accounting policies since the filing of the annual report on Form 10-K, with the exception of recently adopted accounting policies listed below. In the opinion of management, these condensed consolidated financial statements reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for the fair statement of the condensed consolidated financial statements for the interim period. Accounting for Business Combinations. The Company uses the acquisition method of accounting, which is in accordance with ASC 805, Business Combinations, for business combinations and recognizes assets acquired and liabilities assumed measured at their fair values on the date acquired. This requires the Company to recognize separately from goodwill the assets acquired and the liabilities assumed at their acquisition date fair values. Goodwill as of the acquisition date is measured as the excess of consideration transferred over the net of the acquisition date fair values of the assets acquired and the liabilities assumed. While management uses its best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date as well as contingent consideration, where applicable, the estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company adjusts the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recognized in the Company's Consolidated Statements of Operations. Accounting for business combinations requires management to make significant estimates and assumptions, especially at the acquisition date, including estimates for intangible assets, contractual obligations assumed, restructuring liabilities, pre-acquisition contingencies and contingent consideration, where applicable. Although the Company believes the assumptions and estimates made in the past have been reasonable and appropriate, they are based, in part, on historical experience and information obtained from the management of the acquired companies and are inherently uncertain. Critical estimates in valuing certain of the intangible assets that the Company have acquired include, but are not limited to future expected cash flows from product sales, customer contracts and acquired technologies, and discount rates. Unanticipated events and circumstances may occur that may affect the accuracy or validity of such assumptions, estimates or actual results. Trade Receivables Factoring Facility. The Company assumed an agreement with a financial institution to sell certain of its trade receivables from customers with limited, non-credit-related recourse provisions as part of the acquisition during the quarter ended January 3, 2016. Total receivables sold under the factoring facility during the quarter ended January 3, 2016 was $3.1 million. Total collections from the sale of receivables and from deferred purchase payments during the quarter ended January 3, 2016 were $4.2 million and $0.4 million, respectively. Under the terms of the factoring agreement, the total available amount of the factoring facility as of January 3, 2016 was $2.9 million. The sales of accounts receivable in accordance with the factoring agreement are reflected as a reduction of Accounts Receivable, net in the Condensed Consolidated Balance Sheets as they meet the applicable criteria of ASC 860, Transfers and Servicing. Collections of deferred purchase payments are included in the change in accounts receivable under the operating activities section of the Condensed Consolidated Statements of Cash Flows. The amount due from the factoring institution was $0.5 million at January 3, 2016, and is shown in Prepayments and Other Current Assets in the Condensed Consolidated Balance Sheets. The Company pays factoring fees associated with the sale of receivables based on the dollar value of the receivables sold. Such fees are not material for the quarter ended January 3, 2016. Recent Accounting Pronouncements Accounting Pronouncements Adopted in Fiscal 2016 In November 2015, the Financial Accounting Standards Board (FASB) issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes, amending the current accounting guidance and requiring an entity to classify all deferred tax assets and liabilities as non-current in a classified statement of financial position. The standard is effective for reporting periods beginning after December 15, 2016. Early adoption is permitted and the standard may be adopted either prospectively or retrospectively. The Company has early adopted the standard prospectively in the quarter ended January 3, 2016. The adoption resulted in a reclassification from current deferred tax liabilities of $1.4 million, net of deferred non-current tax assets of $0.7 million, to non-current deferred tax liabilities. In April 2015, the FASB issued ASU No. 2015-03, Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs, that requires an entity to present debt issuance costs on the balance sheet as a direct deduction from the related debt liability as opposed to an asset. Amortization of the costs will continue to be reported as interest expense. The update is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued, and the new guidance would be applied retrospectively to all prior periods presented. The Company has early adopted the standard in the quarter ended January 3, 2016. There was no impact to prior periods. Accounting Pronouncements Not Yet Effective for Fiscal 2016 In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which require equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The guidance simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value. The guidance eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, and require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The guidance also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. Separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements is required under this guidance. The guidance further clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. The guidance is applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption and is effective for the Company in its first quarter of fiscal 2018. Early adoption is permitted only if certain criteria is met. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements and related disclosures. In September 2015, the FASB issued ASU No. 2015-16, Simplifying Accounting for Measurement-period Adjustment, which provides that an acquirer should recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. Under this guidance, the acquirer is required to record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. It is also required to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. Early adoption is permitted. The guidance is applied prospectively and is effective for the Company in its first quarter of fiscal years 2017. In July 2015, the FASB issued guidance applying to inventory measured using any other method other than last-in, last-out method. Under this guidance, inventory is measured at the lower of cost and net realizable value. The net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. The guidance is applied prospectively and is effective for the Company in its first quarter of fiscal 2018. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s financial statements and related disclosures. On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard permits the use of either the retrospective or cumulative effect transition method. On July 9, 2015, the FASB decided to delay the effective date by one year to December 15, 2017 for annual periods beginning after that date. The FASB also decided to allow early adoption of the standard, but not before the original effective date of December 15, 2016. The Company is currently evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.

Summary of Significant Accounting Policies

Nature of Business. Integrated Device Technology, Inc. (IDT or the Company) designs, develops, manufactures and markets a broad range of integrated circuits for the advanced communications, computing, consumer and automotive industries.

Basis of Presentation. The Company's fiscal year is the 52 or 53 week period ending on the Sunday closest to March 31. In a 52 week year, each fiscal quarter consists of 13 weeks. In a 53 week year, the additional week is usually added to the third quarter, making such quarter consist of 14 weeks. The first and second quarters of fiscal 2016 and fiscal 2015 were 13 week periods, the third quarter of fiscal 2016 was 14 weeks, and the third quarter of fiscal 2015 was 13 weeks.

On December 7, 2015, the Company completed its acquisition of Zentrum Mikroelektronik Dresden AG (ZMDI), a privately-held company mainly operating in Germany, for a purchase price of Euro-equivalent of $307.0 million. The unaudited condensed consolidated financial statements include the results of operations of ZMDI, commencing on the closing date of the acquisition.

Principles of Consolidation. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated.

Use of Estimates. The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Significant Accounting Policies. For a description of significant accounting policies, see Note 1, Summary of Significant Accounting Policies to the consolidated financial statements included in the Company's annual report on Form 10-K for the fiscal year ended March 29, 2015. There have been no material changes to the Company's significant accounting policies since the filing of the annual report on Form 10-K, with the exception of recently adopted accounting policies listed below.

In the opinion of management, these condensed consolidated financial statements reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for the fair statement of the condensed consolidated financial statements for the interim period.

Accounting for Business Combinations. The Company uses the acquisition method of accounting, which is in accordance with ASC 805, Business Combinations, for business combinations and recognizes assets acquired and liabilities assumed measured at their fair values on the date acquired. This requires the Company to recognize separately from goodwill the assets acquired and the liabilities assumed at their acquisition date fair values. Goodwill as of the acquisition date is measured as the excess of consideration transferred over the net of the acquisition date fair values of the assets acquired and the liabilities assumed. While management uses its best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date as well as contingent consideration, where applicable, the estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company adjusts the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recognized in the Company's Consolidated Statements of Operations.

Accounting for business combinations requires management to make significant estimates and assumptions, especially at the acquisition date, including estimates for intangible assets, contractual obligations assumed, restructuring liabilities, pre-acquisition contingencies and contingent consideration, where applicable. Although the Company believes the assumptions and estimates made in the past have been reasonable and appropriate, they are based, in part, on historical experience and information obtained from the management of the acquired companies and are inherently uncertain. Critical estimates in valuing certain of the intangible assets that the Company have acquired include, but are not limited to future expected cash flows from product sales, customer contracts and acquired technologies, and discount rates. Unanticipated events and circumstances may occur that may affect the accuracy or validity of such assumptions, estimates or actual results.

Trade Receivables Factoring Facility. The Company assumed an agreement with a financial institution to sell certain of its trade receivables from customers with limited, non-credit-related recourse provisions as part of the acquisition during the quarter ended January 3, 2016. Total receivables sold under the factoring facility during the quarter ended January 3, 2016 was $3.1 million. Total collections from the sale of receivables and from deferred purchase payments during the quarter ended January 3, 2016 were $4.2 million and $0.4 million, respectively. Under the terms of the factoring agreement, the total available amount of the factoring facility as of January 3, 2016 was $2.9 million. The sales of accounts receivable in accordance with the factoring agreement are reflected as a reduction of Accounts Receivable, net in the Condensed Consolidated Balance Sheets as they meet the applicable criteria of ASC 860, Transfers and Servicing. Collections of deferred purchase payments are included in the change in accounts receivable under the operating activities section of the Condensed Consolidated Statements of Cash Flows. The amount due from the factoring institution was $0.5 million at January 3, 2016, and is shown in Prepayments and Other Current Assets in the Condensed Consolidated Balance Sheets. The Company pays factoring fees associated with the sale of receivables based on the dollar value of the receivables sold. Such fees are not material for the quarter ended January 3, 2016.

Recent Accounting Pronouncements

Accounting Pronouncements Adopted in Fiscal 2016

In November 2015, the Financial Accounting Standards Board (FASB) issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes, amending the current accounting guidance and requiring an entity to classify all deferred tax assets and liabilities as non-current in a classified statement of financial position. The standard is effective for reporting periods beginning after December 15, 2016. Early adoption is permitted and the standard may be adopted either prospectively or retrospectively. The Company has early adopted the standard prospectively in the quarter ended January 3, 2016. The adoption resulted in a reclassification from current deferred tax liabilities of $1.4 million, net of deferred non-current tax assets of $0.7 million, to non-current deferred tax liabilities.

In April 2015, the FASB issued ASU No. 2015-03, Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs, that requires an entity to present debt issuance costs on the balance sheet as a direct deduction from the related debt liability as opposed to an asset. Amortization of the costs will continue to be reported as interest expense. The update is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued, and the new guidance would be applied retrospectively to all prior periods presented. The Company has early adopted the standard in the quarter ended January 3, 2016. There was no impact to prior periods.

Accounting Pronouncements Not Yet Effective for Fiscal 2016

In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which require equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The guidance simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value. The guidance eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, and require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The guidance also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. Separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements is required under this guidance. The guidance further clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. The guidance is applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption and is effective for the Company in its first quarter of fiscal 2018. Early adoption is permitted only if certain criteria is met. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements and related disclosures.

In September 2015, the FASB issued ASU No. 2015-16, Simplifying Accounting for Measurement-period Adjustment, which provides that an acquirer should recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. Under this guidance, the acquirer is required to record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. It is also required to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. Early adoption is permitted. The guidance is applied prospectively and is effective for the Company in its first quarter of fiscal years 2017.

In July 2015, the FASB issued guidance applying to inventory measured using any other method other than last-in, last-out method. Under this guidance, inventory is measured at the lower of cost and net realizable value. The net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. The guidance is applied prospectively and is effective for the Company in its first quarter of fiscal 2018. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s financial statements and related disclosures.

On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard permits the use of either the retrospective or cumulative effect transition method. On July 9, 2015, the FASB decided to delay the effective date by one year to December 15, 2017 for annual periods beginning after that date. The FASB also decided to allow early adoption of the standard, but not before the original effective date of December 15, 2016. The Company is currently evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.