Summary of Significant Accounting Policies	3 Months Ended
Jul. 02, 2017
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 quarter of fiscal 2018 and fiscal 2017 were 13 week periods. 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 April 2, 2017. On April 4, 2017, the Company completed its acquisition of GigPeak, Inc. (GigPeak), a publicly held company mainly operating in the United States, for a purchase price of $250.1 million (refer to Note 3 for details). As a result of new revenue sources from the GigPeak business, the Company adopted the following revenue recognition policy in addition to its existing revenue recognition policy prior to the GigPeak acquisition. Revenue Recognition The Company recognizes software royalty revenue based on reports received from customers during the quarter, assuming that all other revenue recognition criteria are met. The customers generally report shipment information typically within 45 days following the end of their respective quarters. Other than the above, there have been no material changes to the Company's significant accounting policies since the filing of the annual report on Form 10-K. In the opinion of management, these condensed consolidated financial statements, consisting only of normal recurring adjustments, reflect all adjustments which are necessary for the fair statement of the condensed consolidated financial statements for the interim period. Recent Accounting Pronouncements In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs, settlement of contingent consideration arising from a business combination, insurance settlement proceeds, and distributions from certain equity method investees. The adoption of ASU No. 2016-15 is required to be applied retrospectively. The Company adopted the new guidance in the first quarter of fiscal 2018. There was no material impact upon adoption. In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which provides the 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 Company adopted the new guidance prospectively in the first quarter of fiscal 2018. There was no material impact to the period of adoption. Accounting Pronouncements Not Yet Effective for Fiscal 2018 In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting, which amends the requirements in GAAP related to accounting in changes to stock compensation awards. The guidance in ASU 2017-09 is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350), which simplifies the measurement of goodwill by eliminating the Step 2 impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for goodwill impairment tests in fiscal years beginning after December 15, 2019, though early adoption is permitted. The Company does not believe that the adoption of this new accounting guidance will have any material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805), which clarifies the definition of business. The update provides a more robust framework to use in determining when a set of assets and activities is a business. The new guidance provides a screen to determine when a set is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. The new guidance becomes effective in fiscal years beginning after December 15, 2017, though early adoption is permitted. The new guidance should be applied prospectively on or after the effective date. No disclosures are required at transition. The Company does not believe that the adoption of this new accounting guidance will have any material impact on its consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory, which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. This amends current GAAP which prohibits recognition of current and deferred income taxes for all types of intra-entity asset transfers until the asset has been sold to a third party or otherwise recovered through use. The new standard will be effective for the Company starting in the first quarter of fiscal 2019. Upon adoption, companies must apply a modified retrospective transition approach through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. As of July 2, 2017, the Company has a deferred tax charge of $4.8 million recorded in prepayments and other current assets and other assets, which represents the tax expense that was deferred in accordance with current GAAP. At adoption, the Company will recognize the unamortized portion of the deferred tax charge through a cumulative-effect adjustment to accumulated deficit. Additionally, a deferred tax asset will be recognized, through a cumulative-effect adjustment to accumulated deficit, for the unamortized tax basis in the assets, which as of July 2, 2017 would have been $0.8 million. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses, which changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The new guidance will be effective for the Company starting in the first quarter of fiscal 2021. Early adoption is permitted starting in the first quarter of fiscal 2020. The Company is in the process of determining the effects the adoption will have on its consolidated financial statements. In February 2016, the FASB issued an ASU 2016-02, Leases (Topic 842). The core principle of Topic 842 is that a lessee should recognize the assets and liabilities that arise from leases. All leases create a right-of-use asset and a liability for the lessee in accordance with FASB Concepts Statement No. 6, Elements of Financial Statements, and, therefore, recognition of those lease assets and lease liabilities represents an improvement over previous GAAP, which did not require lease assets and lease liabilities to be recognized for most leases. This ASU is effective for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous GAAP. The Company is currently evaluating the effect this new guidance will have on its consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which changes the current accounting related to (i) the classification and measurement of certain equity investments, (ii) the presentation of changes in the fair value of financial liabilities measured under the fair value option that are due to instrument-specific credit risk, and (iii) certain disclosures associated with the fair value of financial instruments. Most notably, ASU 2016-01 requires that equity investments, with certain exemptions, be measured at fair value with changes in fair value recognized in net income as opposed to other comprehensive income. 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 cumulative-effect adjustment to the balance sheet as of the beginning of fiscal year of adoption and is effective for the Company in its first quarter of fiscal 2019. Early adoption is permitted only if certain criteria are met. The Company is currently evaluating the effect this new guidance will have on its consolidated financial statements. 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. The FASB also decided to allow early adoption of the standard, but not before the original effective date of December 15, 2016. In March, April and May 2016, the FASB issued additional updates to the new revenue standard relating to reporting revenue on a gross versus net basis, identifying performance obligations and licensing arrangements, and narrow-scope improvements and practical expedients, respectively. The new standard will be effective for the Company beginning April 2, 2018. The Company has elected to use the modified retrospective method as its transition method in adoption of the new revenue standard. The Company is still finalizing the analysis to quantify the overall potential impact of the new standard, including any impacts from recently issued amendments and the guidance issued by the FASB Transition Resource Group. Since the Company has certain distributors for which revenue is recognized upon shipment, with reserves recorded for the estimated return and pricing adjustment exposures, the Company does not expect the new standard to materially impact the timing of recognition of future revenue from such distributors. The Company has also started its assessment to determine the revenue recognition impact of its recent acquisition of GigPeak.

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 quarter of fiscal 2018 and fiscal 2017 were 13 week periods.

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 April 2, 2017. On April 4, 2017, the Company completed its acquisition of GigPeak, Inc. (GigPeak), a publicly held company mainly operating in the United States, for a purchase price of $250.1 million (refer to Note 3 for details). As a result of new revenue sources from the GigPeak business, the Company adopted the following revenue recognition policy in addition to its existing revenue recognition policy prior to the GigPeak acquisition.

Revenue Recognition

The Company recognizes software royalty revenue based on reports received from customers during the quarter, assuming that all other revenue recognition criteria are met. The customers generally report shipment information typically within 45 days following the end of their respective quarters.

Other than the above, there have been no material changes to the Company's significant accounting policies since the filing of the annual report on Form 10-K.

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

Recent Accounting Pronouncements

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs, settlement of contingent consideration arising from a business combination, insurance settlement proceeds, and distributions from certain equity method investees. The adoption of ASU No. 2016-15 is required to be applied retrospectively. The Company adopted the new guidance in the first quarter of fiscal 2018. There was no material impact upon adoption.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which provides the 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 Company adopted the new guidance prospectively in the first quarter of fiscal 2018. There was no material impact to the period of adoption.

Accounting Pronouncements Not Yet Effective for Fiscal 2018

In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting, which amends the requirements in GAAP related to accounting in changes to stock compensation awards. The guidance in ASU 2017-09 is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements and related disclosures.

In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350), which simplifies the measurement of goodwill by eliminating the Step 2 impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for goodwill impairment tests in fiscal years beginning after December 15, 2019, though early adoption is permitted. The Company does not believe that the adoption of this new accounting guidance will have any material impact on its consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805), which clarifies the definition of business. The update provides a more robust framework to use in determining when a set of assets and activities is a business. The new guidance provides a screen to determine when a set is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. The new guidance becomes effective in fiscal years beginning after December 15, 2017, though early adoption is permitted. The new guidance should be applied prospectively on or after the effective date. No disclosures are required at transition. The Company does not believe that the adoption of this new accounting guidance will have any material impact on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory, which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. This amends current GAAP which prohibits recognition of current and deferred income taxes for all types of intra-entity asset transfers until the asset has been sold to a third party or otherwise recovered through use. The new standard will be effective for the Company starting in the first quarter of fiscal 2019. Upon adoption, companies must apply a modified retrospective transition approach through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. As of July 2, 2017, the Company has a deferred tax charge of $4.8 million recorded in prepayments and other current assets and other assets, which represents the tax expense that was deferred in accordance with current GAAP. At adoption, the Company will recognize the unamortized portion of the deferred tax charge through a cumulative-effect adjustment to accumulated deficit. Additionally, a deferred tax asset will be recognized, through a cumulative-effect adjustment to accumulated deficit, for the unamortized tax basis in the assets, which as of July 2, 2017 would have been $0.8 million.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses, which changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The new guidance will be effective for the Company starting in the first quarter of fiscal 2021. Early adoption is permitted starting in the first quarter of fiscal 2020. The Company is in the process of determining the effects the adoption will have on its consolidated financial statements.

In February 2016, the FASB issued an ASU 2016-02, Leases (Topic 842). The core principle of Topic 842 is that a lessee should recognize the assets and liabilities that arise from leases. All leases create a right-of-use asset and a liability for the lessee in accordance with FASB Concepts Statement No. 6, Elements of Financial Statements, and, therefore, recognition of those lease assets and lease liabilities represents an improvement over previous GAAP, which did not require lease assets and lease liabilities to be recognized for most leases. This ASU is effective for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous GAAP. The Company is currently evaluating the effect this new guidance will have on its consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which changes the current accounting related to (i) the classification and measurement of certain equity investments, (ii) the presentation of changes in the fair value of financial liabilities measured under the fair value option that are due to instrument-specific credit risk, and (iii) certain disclosures associated with the fair value of financial instruments. Most notably, ASU 2016-01 requires that equity investments, with certain exemptions, be measured at fair value with changes in fair value recognized in net income as opposed to other comprehensive income. 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 cumulative-effect adjustment to the balance sheet as of the beginning of fiscal year of adoption and is effective for the Company in its first quarter of fiscal 2019. Early adoption is permitted only if certain criteria are met. The Company is currently evaluating the effect this new guidance will have on its consolidated financial statements.

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. The FASB also decided to allow early adoption of the standard, but not before the original effective date of December 15, 2016. In March, April and May 2016, the FASB issued additional updates to the new revenue standard relating to reporting revenue on a gross versus net basis, identifying performance obligations and licensing arrangements, and narrow-scope improvements and practical expedients, respectively. The new standard will be effective for the Company beginning April 2, 2018. The Company has elected to use the modified retrospective method as its transition method in adoption of the new revenue standard. The Company is still finalizing the analysis to quantify the overall potential impact of the new standard, including any impacts from recently issued amendments and the guidance issued by the FASB Transition Resource Group. Since the Company has certain distributors for which revenue is recognized upon shipment, with reserves recorded for the estimated return and pricing adjustment exposures, the Company does not expect the new standard to materially impact the timing of recognition of future revenue from such distributors. The Company has also started its assessment to determine the revenue recognition impact of its recent acquisition of GigPeak.