Plantronics (POLY) 10-Q 1 Nov 16 2017 Q2 Quarterly report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	6 Months Ended
	Sep. 30, 2016	Oct. 28, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	PLANTRONICS INC /CA/
Entity Central Index Key	914,025
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		33,287,081

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 244,455	$ 235,266
Short-term investments	178,485	160,051
Accounts receivable, net	136,779	128,219
Inventory, net	52,686	53,162
Other current assets	27,476	20,297
Total current assets	639,881	596,995
Long-term investments	130,695	145,623
Property, plant, and equipment, net	152,263	149,735
Goodwill and purchased intangibles, net	15,702	15,827
Deferred tax and other assets	21,986	25,257
Total assets	960,527	933,437
Current liabilities:
Accounts payable	42,779	39,133
Accrued liabilities	71,452	70,034
Total current liabilities	114,231	109,167
Long term debt, net of issuance costs	490,334	489,609
Long-term income taxes payable	12,874	11,968
Other long-term liabilities	12,392	10,294
Total liabilities	629,831	621,038
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock	802	793
Additional paid-in capital	791,582	769,489
Accumulated other comprehensive income	4,160	3,759
Retained earnings	288,181	257,291
Total stockholders' equity before treasury stock	1,084,725	1,031,332
Less: Treasury stock, at cost	(754,029)	(718,933)
Total stockholders' equity	330,696	312,399
Total liabilities and stockholders' equity	$ 960,527	$ 933,437

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net revenues	$ 216,183	$ 215,017	$ 439,289	$ 421,375
Cost of revenues	105,737	104,047	215,770	203,047
Gross profit	110,446	110,970	223,519	218,328
Operating expenses:
Research, development, and engineering	22,379	22,609	44,723	45,803
Selling, general, and administrative	56,875	54,296	112,662	109,974
(Gain) loss, net from litigation settlements	(349)	(31)	4,390	(907)
Restructuring and other related charges/adjustments	(415)	0	(1,463)	0
Total operating expenses	78,490	76,874	160,312	154,870
Operating income	31,956	34,096	63,207	63,458
Interest expense	(7,257)	(7,320)	(14,545)	(10,061)
Other non-operating income and (expense), net	1,340	(2,138)	3,692	(2,423)
Income before income taxes	26,039	24,638	52,354	50,974
Income tax expense	5,565	6,742	11,493	11,850
Net income	$ 20,474	$ 17,896	$ 40,861	$ 39,124
Earnings per common share:
Basic (in dollars per share)	$ 0.63	$ 0.53	$ 1.27	$ 1.09
Diluted (in dollars per share)	$ 0.63	$ 0.52	$ 1.24	$ 1.07
Shares used in computing basic earnings per common share	32,281	33,590	32,269	35,796
Shares used in computing diluted earnings per common share	32,726	34,245	32,865	36,676
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15	$ 0.30	$ 0.30

CONDENSED CONSOLIDATED STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 20,474	$ 17,896	$ 40,861	$ 39,124
Other comprehensive income (loss):
Foreign currency translation adjustments	4	563	(250)	551
Unrealized gains (losses) on cash flow hedges:
Unrealized cash flow hedge gains (losses) arising during the period	(650)	(1,976)	304	(4,814)
Net (gains) losses reclassified into income for revenue hedges	825	2,197	985	5,735
Net (gains) losses reclassified into income for cost of revenue hedges	589	1,171	1,316	1,944
Net unrealized gains (losses) on cash flow hedges	(886)	(3,002)	635	(8,605)
Unrealized holding gains (losses) during the period	(272)	(126)	42	(208)
Aggregate income tax benefit (expense) of the above items	98	66	(26)	198
Other comprehensive income (loss)	(1,056)	(2,499)	401	(8,064)
Comprehensive income	$ 19,418	$ 15,397	$ 41,262	$ 31,060

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 40,861	$ 39,124
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,265	9,819
Amortization of debt issuance costs	725	483
Stock-based compensation	16,316	16,882
Excess tax benefit from stock-based compensation	(939)	(3,150)
Deferred income taxes	2,499	2,807
Provision for excess and obsolete inventories	1,674	1,084
Restructuring charges/adjustments	(1,463)	0
Cash payments for restructuring charges	(3,736)	0
Other operating activities	(849)	3,037
Changes in assets and liabilities, net of effect of acquisition:
Accounts receivable, net	(8,366)	(2,825)
Inventory, net	(1,102)	(2,166)
Current and other assets	(2,331)	(2,190)
Accounts payable	4,120	9,016
Accrued liabilities	10,444	671
Income taxes	(2,305)	(6,144)
Cash provided by operating activities	65,813	66,448
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sales of investments	125,504	24,829
Proceeds from maturities of investments	63,853	40,405
Purchase of investments	(192,349)	(61,591)
Capital expenditures	(14,191)	(13,092)
Cash used for investing activities	(17,183)	(9,449)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(26,828)	(473,220)
Employees' tax withheld and paid for restricted stock and restricted stock units	(9,123)	(10,499)
Proceeds from issuances under stock-based compensation plans	5,752	9,071
Proceeds from revolving line of credit	0	155,749
Repayments of revolving line of credit	0	(190,249)
Proceeds from bonds issuance, net of issuance costs	0	488,401
Payment of cash dividends	(9,971)	(10,986)
Excess tax benefit from stock-based compensation	939	3,150
Other financing activity	761	0
Cash used for financing activities	(38,470)	(28,583)
Effect of exchange rate changes on cash and cash equivalents	(971)	(430)
Net increase in cash and cash equivalents	9,189	27,986
Cash and cash equivalents at beginning of period	235,266	276,850
Cash and cash equivalents at end of period	$ 244,455	$ 304,836

BASIS OF PRESENTATION

BASIS OF PRESENTATION	6 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION In the opinion of management, the accompanying unaudited condensed consolidated financial statements ("financial statements") of Plantronics, Inc. ("Plantronics" or "the Company") have been prepared on a basis consistent with the Company's March 31, 2016 audited consolidated financial statements and include all adjustments, consisting of normal recurring adjustments, necessary to fairly state the information set forth herein. Certain information and footnote disclosures normally included in financial statements prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC") applicable to interim financial information and in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. The financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2016 , which was filed with the SEC on May 16, 2016 . The results of operations for the interim period ended September 30, 2016 are not necessarily indicative of the results to be expected for the entire fiscal year or any future period. The financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated. The Company’s fiscal year ends on the Saturday closest to the last day of March. The Company’s current fiscal year ends on April 1, 2017 and consists of 52 weeks. The Company's prior fiscal year ended on April 2, 2016 and consisted of 53 weeks. The Company’s results of operations for the three and six months ended October 1, 2016 and September 26, 2015 both contain 13 and 26 weeks, respectively. For purposes of presentation, the Company has indicated its accounting year as ending on March 31 and its interim quarterly periods as ending on the applicable calendar month end.

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	6 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS Recently Issued Pronouncements In August 2016, the Financial Accounting Standards Board ("FASB") issued additional guidance regarding the presentation and classification of certain cash receipts and cash payments in the statement of cash flows. This guidance is intended to eliminate the diversity in practice by adding or clarifying guidance on eight specific cash flow issues. The guidance is effective for the Company's fiscal year ending March 31, 2019 with early adoption permitted provided that all of the amendments are adopted in the same period. The guidance requires application using a retrospective transition method unless deemed impracticable, in which case, prospective application is permitted. The Company is currently evaluating the impact the adoption of this standard will have on its statement of cash flows. In June 2016, the FASB issued additional guidance regarding the measurement of credit losses on financial instruments, which changes the impairment model for most financial assets. The new model uses a forward-looking expected loss method, which will generally result in earlier recognition of allowances for losses. The guidance is effective for the Company's fiscal year ending March 31, 2021 with early adoption permitted beginning in the first quarter of fiscal year 2020. The Company is currently evaluating the impact the adoption of this standard will have on its results of operations, financial position, and cash flows. In March 2016, the FASB issued additional guidance regarding share-based compensation, which outlines new provisions intended to simplify various aspects related to accounting for share-based payments and their presentation in the financial statements. The guidance is effective for the Company's fiscal year ending March 31, 2018. Early adoption is permitted. The Company is currently evaluating the impact the adoption of this standard will have on its results of operations, financial position, and cash flows. In February 2016, the FASB issued additional guidance regarding both operating and financing leases, requiring lessees to recognize on their balance sheets “right-of-use assets” and corresponding lease liabilities, measured on a discounted basis over the lease term. Virtually all leases will be subject to this treatment except leases that meet the definition of a “short-term lease.” For expense recognition, the dual model requiring leases to be classified as either operating or finance leases has been retained from the prior standard. Operating leases will result in straight-line expense while finance leases will result in a front-loaded expense pattern. Classification will use criteria very similar to those applied in current lease accounting, but without explicit bright lines. The new lease guidance will essentially eliminate off-balance sheet financing. The guidance is effective for the Company's fiscal year ending March 31, 2020. The new standard must be adopted using a modified retrospective transition that provides for certain practical expedients and requires the new guidance to be applied at the beginning of the earliest comparative period presented. While we are not yet in a position to assess the full impact of the application of the new standard, the Company expects that the impact of recording the lease liabilities and the corresponding right-to-use assets may have a significant impact on its total assets and liabilities with a minimal impact on its equity. In January 2016, the FASB issued additional guidance regarding the recognition and measurement of financial assets and liabilities. Changes to the current GAAP model primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The Company is required to adopt the standard in the first quarter of its fiscal year ending March 31, 2019, but may elect to adopt earlier as permitted under the standard. The Company is currently evaluating what impact, if any, the adoption of this standard will have on its results of operations, financial position, and cash flows. In July 2015, the FASB issued additional guidance regarding the subsequent measurement of inventory by requiring inventory to be measured at the lower of cost and net realizable value. The Company is required to adopt the standard in the first quarter of its fiscal year ending March 31, 2018, but may elect to adopt earlier as permitted under the standard. The adoption is not expected to have a material impact on the Company's results of operations, financial position, or cash flows. In May 2014, the FASB issued additional guidance regarding revenue from contracts with customers. While the standard supersedes existing revenue recognition guidance, it closely aligns with current GAAP. Under the new standard, revenue will be recognized at the time a good or service is transferred to a customer for the amount of consideration received for that specific good or service. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. In March 2016, the FASB issued additional guidance concerning "Principal versus Agent" considerations (reporting revenue gross versus net); in April 2016, the FASB issued additional guidance on identifying performance obligations and licensing; and in May 2016, the FASB issued additional guidance on collectability, noncash consideration, presentation of sales tax, and transition. These updates are intended to improve the operability and understandability of the implementation guidance and have the same effective date and transition requirements as the greater "contracts with customers" standard. The Company is required to adopt the standard, as amended, in the first quarter of its fiscal year ending March 31, 2019 although, under the standard, it may adopt as early as the first quarter of its fiscal year ending March 31, 2018. Presently, the Company is not yet in a position to assess the application date. The Company has not yet completed its final review of the impact of this guidance, although it currently does not anticipate a material impact on its revenue recognition practices. The Company continues to review variable consideration, potential disclosures, and its method of adoption to complete its evaluation of the impact on its consolidated financial statements. In addition, the Company will continue to monitor additional changes, modifications, clarifications or interpretations being undertaken by the FASB, which may impact its current conclusions.

CASH, CASH EQUIVALENTS, AND INV

CASH, CASH EQUIVALENTS, AND INVESTMENTS	6 Months Ended
	Sep. 30, 2016
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]
CASH, CASH EQUIVALENTS, AND INVESTMENTS	CASH, CASH EQUIVALENTS, AND INVESTMENTS The following tables summarize the Company’s cash and available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category recorded as cash and cash equivalents, short-term, or long-term investments as of September 30, 2016 and March 31, 2016 (in thousands): September 30, 2016 Amortized Gross Gross Fair Cash & Cash Equivalents Short-term investments (due in 1 year or less) Long-term investments (due in 1 to 3 years) Cash $ 236,361 $ — $ — $ 236,361 $ 236,361 $ — $ — Level 1: Mutual Funds 11,399 198 (53 ) 11,544 — 11,544 — US Treasury Notes 20,534 24 (4 ) 20,554 — 11,974 8,580 Subtotal 31,933 222 (57 ) 32,098 — 23,518 8,580 Level 2: Government Agency Securities 55,039 29 (11 ) 55,057 — 12,239 42,818 Commercial Paper 58,506 — — 58,506 8,094 50,412 — Corporate Bonds 148,547 216 (66 ) 148,697 — 73,110 75,587 Certificates of Deposits ("CDs") 22,916 — — 22,916 — 19,206 3,710 Subtotal 285,008 245 (77 ) 285,176 8,094 154,967 122,115 Total cash, cash equivalents $ 553,302 $ 467 $ (134 ) $ 553,635 $ 244,455 $ 178,485 $ 130,695 March 31, 2016 Amortized Gross Gross Fair Cash & Cash Equivalents Short-term investments (due in 1 year or less) Long-term investments (due in 1 to 3 years) Cash $ 232,600 $ — $ — $ 232,600 $ 232,600 $ — $ — Level 1: Mutual Funds 10,025 32 (548 ) 9,509 — 9,509 — US Treasury Notes 25,051 21 (9 ) 25,063 — 12,993 12,070 Subtotal 35,076 53 (557 ) 34,572 — 22,502 12,070 Level 2: Government Agency Securities 72,698 24 (20 ) 72,702 — 10,521 62,181 Commercial Paper 37,628 — — 37,628 650 36,978 — Corporate Bonds 147,662 234 (97 ) 147,799 2,016 77,115 68,668 Certificates of Deposits ("CDs") 15,639 — — 15,639 — 12,935 2,704 Subtotal 273,627 258 (117 ) 273,768 2,666 137,549 133,553 Total cash, cash equivalents $ 541,303 $ 311 $ (674 ) $ 540,940 $ 235,266 $ 160,051 $ 145,623 As of September 30, 2016 and March 31, 2016 , with the exception of assets related to the Company's deferred compensation plan, all of the Company's investments are classified as available-for-sale securities. The carrying value of available-for-sale securities included in cash equivalents approximates fair value because of the short maturity of those instruments. For more information regarding the Company's deferred compensation plan, refer to Note 4 , Deferred Compensation , of the accompanying notes to condensed consolidated financial statements (unaudited) in this Quarterly Report on Form 10-Q. The Company did not incur any material realized or unrealized gains or losses in the three and six months ended September 30, 2015 and 2016 . There were no transfers between fair value measurement levels during the three and six months ended September 30, 2015 and 2016 . All financial assets and liabilities are recognized or disclosed at fair value in the financial statements or the accompanying notes thereto. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: Level 1 The Company's Level 1 financial assets consist of Mutual Funds and US Treasury Notes. The fair value of Level 1 financial instruments is measured based on the quoted market price of identical securities. Level 2 The Company's Level 2 financial assets and liabilities consist of Government Agency Securities, Commercial Paper, Corporate Bonds, and Certificates of Deposits ("CDs") , derivative foreign currency contracts, and long-term debt. The fair value of Level 2 investment securities is determined based on other observable inputs, including multiple non-binding quotes from independent pricing services. Non-binding quotes are based on proprietary valuation models that are prepared by the independent pricing services and use algorithms based on inputs such as observable market data, quoted market prices for similar securities, issuer spreads, and internal assumptions of the broker. The Company corroborates the reasonableness of non-binding quotes received from the independent pricing services using a variety of techniques depending on the underlying instrument, including: (i) comparing them to actual experience gained from the purchases and maturities of investment securities, (ii) comparing them to internally developed cash flow models based on observable inputs, and (iii) monitoring changes in ratings of similar securities and the related impact on fair value. The fair value of Level 2 derivative foreign currency contracts is determined using pricing models that use observable market inputs. For more information regarding the Company's derivative assets and liabilities, refer to Note 11 , Foreign Currency Derivatives , of the accompanying notes to condensed consolidated financial statements (unaudited) in this Quarterly Report on Form 10-Q. The fair value of Level 2 long-term debt is determined based on inputs that were observable in the market, including the trading price of the notes when available. For more information regarding the Company's 5.50% Senior Notes, refer to Note 7 , Debt , of the accompanying notes to condensed consolidated financial statements (unaudited) in this Quarterly Report on Form 10-Q. Level 3 The Company's unsecured revolving credit facility falls under the Level 3 hierarchy. The fair value of the Company’s line of credit approximates its carrying value because the interest rate is a variable rate that approximates rates currently available to the Company.

DEFERRED COMPENSATION

DEFERRED COMPENSATION	6 Months Ended
	Sep. 30, 2016
Compensation Related Costs [Abstract]
DEFERRED COMPENSATION	DEFERRED COMPENSATION As of September 30, 2016 , the Company held bank deposits of $0.8 million and investments in mutual funds totaling $11.5 million , all of which related to debt and equity securities that are held in rabbi trusts under non-qualified deferred compensation plans. The total related deferred compensation liability was $12.8 million at September 30, 2016 . The fair value of debt and equity securities held in the rabbi trusts at March 31, 2016 was $9.5 million . The total related deferred compensation liability at March 31, 2016 was $10.7 million . The bank deposits are recorded on the condensed consolidated balance sheets under "Cash and cash equivalents". The securities are classified as trading securities and are recorded on the condensed consolidated balance sheets under "Short-term investments". The liability is recorded on the condensed consolidated balance sheets under “Other long-term liabilities” and "Accrued liabilities".

DETAILS OF CERTAIN BALANCE SHEE

DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS	6 Months Ended
	Sep. 30, 2016
Balance Sheet Related Disclosures [Abstract]
DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS	DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS Accounts receivable, net: March 31, September 30, (in thousands) 2016 2016 Accounts receivable $ 163,834 $ 174,141 Provisions for returns (7,314 ) (8,559 ) Provisions for promotions, rebates, and other (27,737 ) (28,095 ) Provisions for doubtful accounts and sales allowances (564 ) (708 ) Accounts receivable, net $ 128,219 $ 136,779 Inventory, net: March 31, September 30, (in thousands) 2016 2016 Raw materials $ 21,612 $ 23,858 Work in process 527 345 Finished goods 31,023 28,483 Inventory, net $ 53,162 $ 52,686 Accrued Liabilities: March 31, September 30, (in thousands) 2016 2016 Employee compensation and benefits $ 22,955 $ 28,044 Accrued interest on 5.50% Senior Notes 10,501 10,387 Warranty obligation 8,537 8,540 VAT/Sales tax payable 4,894 5,143 Restructuring and other related charges 5,783 401 Accrued other 17,364 18,937 Accrued liabilities $ 70,034 $ 71,452 The Company's warranty obligation is included as a component of accrued liabilities on the condensed consolidated balance sheets. Changes in the warranty obligation during the six months ended September 30, 2015 and 2016 were as follows: Six Months Ended (in thousands) 2015 2016 Warranty obligation at beginning of period $ 7,717 $ 8,537 Warranty provision related to products shipped 4,520 4,649 Deductions for warranty claims processed (4,257 ) (4,742 ) Adjustments related to preexisting warranties 193 96 Warranty obligation at end of period $ 8,173 $ 8,540

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Unconditional Purchase Obligations The Company purchases materials and services from a variety of suppliers and manufacturers. During the normal course of business and to manage manufacturing operations and general and administrative activities, the Company may enter into firm, non-cancelable, and unconditional purchase obligations for which amounts are not recorded on the consolidated balance sheets. As of September 30, 2016 , the Company had outstanding off-balance sheet third-party manufacturing, component purchase, and other general and administrative commitments of $173.2 million . Other Guarantees and Obligations In the ordinary course of business, the Company may provide indemnifications of varying scope and terms to customers, vendors, lessors, business partners, purchasers of assets or subsidiaries and other parties with respect to certain matters, including, but not limited to, losses arising out of the Company's breach of agreements or representations and warranties made by the Company, services to be provided by the Company, intellectual property infringement claims made by third parties or, with respect to the sale of assets of a subsidiary, matters related to the Company's conduct of business and tax matters prior to the sale. From time to time, the Company indemnifies customers against combinations of loss, expense, or liability arising from various triggering events relating to the sale and use of its products and services. In addition, the Company also provides protection to customers against claims related to undiscovered liabilities, additional product liability, or environmental obligations. The Company has also entered into indemnification agreements with its directors, officers and certain other personnel that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers of the Company or certain of its affiliated entities. The Company maintains director and officer liability insurance, which may cover certain liabilities arising from its obligation to indemnify its directors, officers and certain other personnel in certain circumstances. It is not possible to determine the aggregate maximum potential loss under these agreements due to the limited history of prior claims and the unique facts and circumstances involved in each particular claim. Such indemnification obligations might not be subject to maximum loss clauses. Historically, the Company has not incurred material costs as a result of obligations under these agreements and it has not accrued any liabilities related to such indemnification obligations in the condensed consolidated financial statements. Claims and Litigation On October 12, 2012, GN Netcom, Inc. ("GN") sued the Company in the United States ("U.S.") District Court for the District of Delaware, alleging violations of the Sherman Act, the Clayton Act, and Delaware common law. In its complaint, GN specifically alleges four causes of action: monopolization, attempted monopolization, concerted action in restraint of trade, and tortious interference with business relations. GN claims that the Company dominates the market for headsets sold into contact centers in the U.S. and that a critical channel for sales of headsets to contact centers is through a limited network of specialized independent distributors (“SIDs”). GN asserts that the Company attracts SIDs through exclusive distributor agreements and alleges that the use of these agreements is illegal. On July 6, 2016, the Court in GN Netcom, Inc. v. Plantronics, Inc. ordered the following sanctions against the Company as they relate to certain discovery matters in the litigation: (1) monetary sanctions in the form of reasonable fees and costs incurred by GN in connection with the discovery disputes leading to the motion for sanctions; (2) punitive sanctions in the amount of $3 million ; (3) possible evidentiary sanctions; and (4) instructions to the jury that it may draw an adverse inference that emails destroyed by the Company would have been favorable to GN’s case and/or unfavorable to the Company's defense. As a result, during the three months ended June 30, 2016, the Company accrued $3 million for the punitive sanctions and an additional $2 million , representing the Company’s best estimate of reasonable fees and costs incurred by GN in connection with the disputes leading to the motion for sanctions, for a total of $5 million . The Company paid the $3 million dollars in punitive damages to GN on or about September 1, 2016 and expects to pay the remaining balance, which was reduced to $1.9 million , on or before November 6, 2016. This latter amount is included within accrued liabilities on its condensed consolidated balance sheet. The Company believes that the underlying antitrust action is without merit and is vigorously defending itself. However, following the court order described above, there exists an increased risk of the jury finding in favor of the plaintiff. The Company is unable to provide an estimate of the possible loss or range of possible loss resulting from these allegations and has not accrued any financial damages relating to the antitrust case. The trial for the underlying antitrust case is currently scheduled to commence in October 2017. In addition to the specific matter discussed above, the Company is involved in various legal proceedings arising in the normal course of conducting business. For such legal proceedings, where applicable, the Company has accrued an amount that reflects the aggregate liability deemed probable and estimable, but this amount is not material to the Company's financial condition, results of operations, or cash flows. With respect to proceedings for which no accrual has been made, the Company is not able to estimate an amount or range of any reasonably possible additional losses because of the preliminary nature of many of these proceedings, the difficulty in ascertaining the applicable facts relating to many of these proceedings, the variable treatment of claims made in many of these proceedings, and the difficulty of predicting the settlement value of many of these proceedings. However, based upon the Company's historical experience, the resolution of these proceedings is not expected to have a material effect on the Company's financial condition, results of operations or cash flows. The Company may incur substantial legal fees, which are expensed as incurred, in defending against these legal proceedings.

DEBT

DEBT	6 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
DEBT	DEBT 5.50% Senior Notes In May 2015, the Company issued $500.0 million aggregate principal amount of 5.50% senior notes (the “5.50% Senior Notes”). The 5.50% Senior Notes mature on May 31, 2023, and bear interest at a rate of 5.50% per annum, payable semi-annually on May 15 and November 15 of each year, commencing on November 15, 2015. The Company received net proceeds of $488.4 million from the issuance of the 5.50% Senior Notes, net of issuance costs of $11.6 million which are being amortized to interest expense over the term of the 5.50% Senior Notes using the effective interest method. The fair value of the 5.50% Senior Notes was determined based on inputs that were observable in the market, including the trading price of the 5.50% Senior Notes when available (Level 2). The estimated fair value and carrying value of the 5.50% Senior Notes were as follows: March 31, 2016 September 30, 2016 (in thousands) Fair Value Carrying Value Fair Value Carrying Value 5.50% Senior Notes $ 493,440 $ 489,609 $ 517,500 $ 490,334 The Company may redeem all or a part of the 5.50% Senior Notes, upon not less than 30 or more than a 60 day notice; however, the applicable redemption price will be determined as follows: Redemption Period Requiring Payment of: Redemption Up To 35% Using Cash Proceeds From An Equity Offering (3) : Make-Whole (1) Premium (2) Date Specified Price 5.50% Senior Notes Prior to May 15, 2018 On or after May 15, 2018 Prior to May 15, 2018 105.500% (1) If the Company redeems the notes prior to the applicable date, the redemption price is principal plus a make-whole premium equal to the present value of the remaining scheduled interest payments as described in the applicable indenture, together with accrued and unpaid interest. (2) If the Company redeems the notes on or after the applicable date, the price is principal plus a premium which declines over time as specified in the applicable indenture, together with accrued and unpaid interest. (3) If the Company redeems the notes prior to the applicable date with net cash proceeds of one or more equity offerings, the price is equal to the amount specified above, together with accrued and unpaid interest, subject to a maximum redemption of 35% of the aggregate principal amount of the respective note being redeemed. In addition, upon the occurrence of certain change of control triggering events, the Company may be required to repurchase the 5.50% Senior Notes, at a price equal to 101% of their principal amount, plus accrued and unpaid interest to the date of repurchase. The 5.50% Senior Notes contain restrictive covenants that, among other things, limit the Company's ability to create certain liens and enter into sale and leaseback transactions; create, assume, incur, or guarantee additional indebtedness of its subsidiaries without such subsidiary guaranteeing the 5.50% Senior Notes on an unsecured unsubordinated basis; and consolidate or merge with, or convey, transfer or lease all or substantially all of the assets of the Company and its subsidiaries to another person. As of September 30, 2016 , the Company was in compliance with all covenants. Revolving Credit Agreement On May 9, 2011 , the Company entered into a credit agreement with Wells Fargo Bank, National Association ("the Bank"), which was most recently amended on May 2, 2016 (as amended, the "Amended Credit Agreement") to extend the term of the Credit Agreement by one year to May 9, 2019 , and to waive a default under the Credit Agreement in effect as of March 31, 2016 in which the Company's debt to EBITDA ratio minimally exceeded the previously agreed upon ratio of 3:1. The breach of the covenant was primarily a result of the restructuring expenses recorded in the third and fourth quarters of fiscal year 2016. The Amended Credit Agreement provides for a $100.0 million unsecured revolving credit facility. Revolving loans under the Credit Agreement will bear interest, at the Company’s election, at (i) the Bank’s announced prime rate less 1.20% per annum or (ii) a daily one-month LIBOR rate plus 1.40% per annum. Interest is payable quarterly in arrears on the first day of each April, July, October and January, commencing July 1, 2016. Principal, together with all accrued and unpaid interest, on the revolving loans is due and payable on May 9, 2019 . The Company is also obligated to pay a commitment fee of 0.37% per annum on the average daily unused amount of the revolving line of credit, which fee shall be payable quarterly in arrears on the first day of each April, July, October and January, commencing July 1, 2016. The Company may prepay the loans and terminate the commitments under the Credit Agreement at any time, without premium or penalty, subject to the reimbursement of certain costs. As of March 31, 2016 and September 30, 2016 , the Company had no outstanding borrowings under the line of credit. The Credit Agreement contains customary affirmative and negative covenants, including, among other things, covenants limiting the ability of the Company to incur debt, make capital expenditures, grant liens, merge or consolidate, and make investments. The Credit Agreement also requires the Company to comply with certain financial covenants, including (i) a maximum ratio of funded debt to EBITDA and (ii) a minimum EBITDA coverage ratio, in each case, tested as of each fiscal quarter and determined on a rolling four-quarter basis. In addition, the Company and its subsidiaries are required to maintain unrestricted cash, cash equivalents and marketable securities plus availability under the Credit Agreement at the end of each fiscal quarter of at least $300.0 million . The Credit Agreement contains customary events of default that include, among other things, payment defaults, covenant defaults, cross-defaults with certain other indebtedness, bankruptcy and insolvency defaults, and judgment defaults. The occurrence of an event of default could result in the acceleration of the obligations under the Credit Agreement. On May 2, 2016, the Company received a waiver from the lender for noncompliance with the minimum EBITDA covenant at March 31, 2016. Pursuant to the terms of the waiver and amendment to the Credit Agreement, the $16.2 million of restructuring charges recorded in the Company's fiscal year 2016 will be excluded from the lender’s rolling four-quarter EBITDA calculation. This exclusion of restructuring charges does not automatically extend to any such future charges, should they be incurred. The breach was not considered to be a cross-default on the Company's 5.50% Senior Notes and as such had no impact on the amount or timing of amounts payable related to those debt instruments. As of September 30, 2016 , the Company was in compliance with all ratios and covenants.

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	6 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION The Company recognizes the grant-date fair value of stock-based compensation as compensation expense using the straight-line attribution approach over the service period for which the stock-based compensation is expected to vest. The following table summarizes the amount of stock-based compensation included in the condensed consolidated statements of operations: Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Cost of revenues $ 879 $ 778 $ 1,658 $ 1,620 Research, development, and engineering 2,619 2,408 4,978 4,892 Selling, general, and administrative 5,334 4,717 10,246 9,804 Stock-based compensation included in operating expenses 7,953 7,125 15,224 14,696 Total stock-based compensation 8,832 7,903 16,882 16,316 Income tax benefit (2,642 ) (2,877 ) (4,964 ) (5,649 ) Total stock-based compensation, net of tax $ 6,190 $ 5,026 $ 11,918 $ 10,667

COMMON STOCK REPURCHASES

COMMON STOCK REPURCHASES	6 Months Ended
	Sep. 30, 2016
Equity [Abstract]
COMMON STOCK REPURCHASES	COMMON STOCK REPURCHASES From time to time, the Company's Board of Directors (the "Board") has authorized programs under which the Company may repurchase shares of its common stock, depending on market conditions, in the open market or through privately negotiated transactions. Repurchased shares are held as treasury stock until they are retired or re-issued. Repurchases by the Company pursuant to Board-authorized programs during the six months ended September 30, 2015 and 2016 are discussed below. As of September 30, 2016 , there remained 1,020,990 shares authorized for repurchase under repurchase programs approved by the Board on January 29, 2016 and July 29, 2016 . There were no remaining shares authorized under previously approved programs. In the six months ended September 30, 2015 and 2016 , the Company repurchased 8,492,117 shares and 613,021 shares, respectively, of its common stock in the open market for a total cost of $473.2 million and $26.8 million , respectively, and at an average price per share of $55.72 and $43.76 , respectively. In addition, the Company withheld shares valued at $10.5 million and $9.1 million in the six months ended September 30, 2015 and 2016 , respectively, in satisfaction of employee tax withholding obligations upon the vesting of restricted stock granted under the Company's stock plans. The amounts withheld were equivalent to the employees' minimum statutory tax withholding requirements and are reflected as a financing activity within the Company's condensed consolidated statements of cash flows. These share withholdings have the same effect as share repurchases by the Company as they reduce the number of shares that would have otherwise been issued in connection with the vesting of shares subject to the restricted stock grants.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME	6 Months Ended
	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME	ACCUMULATED OTHER COMPREHENSIVE INCOME The components of accumulated other comprehensive income ("AOCI"), net of immaterial tax effects, are as follows: (in thousands) March 31, 2016 September 30, 2016 Accumulated unrealized gain (loss) on cash flow hedges (1) $ (1,087 ) $ (469 ) Accumulated foreign currency translation adjustments 4,739 4,489 Accumulated unrealized gain (loss) on investments 107 140 Accumulated other comprehensive income $ 3,759 $ 4,160 (1) Refer to Note 11 , Foreign Currency Derivatives, which discloses the nature of the Company's derivative assets and liabilities as of March 31, 2016 and September 30, 2016 .

FOREIGN CURRENCY DERIVATIVES

FOREIGN CURRENCY DERIVATIVES	6 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
FOREIGN CURRENCY DERIVATIVES	FOREIGN CURRENCY DERIVATIVES The Company's foreign currency derivatives consist primarily of foreign currency forward exchange contracts, option contracts, and cross-currency swaps. The Company does not purchase derivative financial instruments for speculative trading purposes. The derivatives expose the Company to credit risk to the extent the counterparties may be unable to meet the terms of the derivative instrument. The Company's maximum exposure to loss that it would incur due to credit risk if parties to derivative contracts failed completely to perform according to the terms of the contracts was equal to the carrying value of the Company's derivative assets as of September 30, 2016 . The Company seeks to mitigate such risk by limiting its counterparties to large financial institutions. In addition, the Company monitors the potential risk of loss with any one counterparty resulting from this type of credit risk on an ongoing basis. The Company enters into master netting arrangements with counterparties when possible to mitigate credit risk in derivative transactions. A master netting arrangement may allow each counterparty to net settle amounts owed between the Company and the counterparty as a result of multiple, separate derivative transactions. As of September 30, 2016 , the Company had International Swaps and Derivatives Association (ISDA) agreements with four applicable banks and financial institutions which contained netting provisions. Plantronics has elected to present the fair value of derivative assets and liabilities on the Company's condensed consolidated balance sheet on a gross basis even when derivative transactions are subject to master netting arrangements and may otherwise qualify for net presentation. For each counterparty, if netted, the Company would offset the asset and liability balances of all derivatives at the end of the reporting period. Derivatives not subject to master netting agreements are not eligible for net presentation. As of March 31, 2016 and September 30, 2016 , no cash collateral had been received or pledged related to these derivative instruments. The gross fair value of the Company's outstanding derivative contracts at the end of each period was as follows: (in thousands) March 31, 2016 September 30, 2016 Derivative Assets (recorded in 'Other current assets') Non-designated hedges $ 33 $ 182 Cash flow hedges 1,952 2,524 Total Derivative Assets $ 1,985 $ 2,706 Derivative Liabilities (recorded in 'Accrued liabilities') Non-designated hedges $ 1,163 $ 79 Cash flow hedges 3,255 2,655 Total Derivative Liabilities $ 4,418 $ 2,734 Non-Designated Hedges As of September 30, 2016 , the Company had foreign currency forward contracts denominated in Euros ("EUR"), British Pound Sterling ("GBP"), Australian Dollars ("AUD"), and Canadian Dollars ("CAD"). The Company does not elect to obtain hedge accounting for these forward contracts. These forward contracts hedge against a portion of the Company’s foreign currency-denominated cash balances, receivables, and payables. The following table summarizes the notional value of the Company’s outstanding foreign exchange currency contracts and approximate U.S. Dollar ("USD") equivalent at September 30, 2016 : (in thousands) Local Currency USD Equivalent Position Maturity EUR € 33,000 $ 37,143 Sell EUR 1 month GBP £ 7,600 $ 9,893 Sell GBP 1 month AUD A$ 13,800 $ 10,569 Sell AUD 1 month CAD C$ 2,230 $ 1,699 Sell CAD 1 month Effect of Non-Designated Derivative Contracts on the Condensed Consolidated Statements of Operations The effect of non-designated derivative contracts recognized in other non-operating income and (expense), net in the condensed consolidated statements of operations was as follows: Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Gain (loss) on foreign exchange contracts $ 1,276 $ (193 ) $ 148 $ 1,750 Cash Flow Hedges Costless Collars The Company hedges a portion of the forecasted EUR and GBP denominated revenues with costless collars. On a monthly basis, the Company enters into option contracts with a six to eleven month term. Collar contracts are scheduled to mature at the beginning of each fiscal quarter, at which time the instruments convert to forward contracts. The Company also enters into cash flow forwards with a three month term. Once the hedged revenues are recognized, the forward contracts become non-designated hedges to protect the resulting foreign monetary asset position for the Company. The notional value of the Company's outstanding EUR and GBP option and forward contracts at the end of each period was as follows: (in millions) March 31, 2016 September 30, 2016 EUR GBP EUR GBP Option contracts €59.4 £18.4 €61.0 £20.0 Forward contracts €23.9 £9.1 €26.5 £4.6 The Company will reclassify all amounts accumulated in other comprehensive income into earnings within the next twelve months. Cross-currency Swaps The Company hedges a portion of the forecasted Mexican Peso (“MXN”) denominated expenditures with a cross-currency swap. A loss of $1.7 million , net of tax, in AOCI as of September 30, 2016 is expected to be reclassified to cost of revenues during the next 12 months due to the recognition of the hedged forecasted expenditures. As of March 31, 2016 and September 30, 2016 , the Company had foreign currency swap contracts of approximately MXN 481.0 million and MXN 491.8 million , respectively. The following table summarizes the notional value of the Company’s outstanding MXN cross-currency swaps and approximate USD Equivalent at September 30, 2016 : (in thousands) Local Currency USD Equivalent Position Maturity MXN 491,790 $ 26,779 Buy MXN Monthly over 21 months Effect of Designated Derivative Contracts on AOCI and Condensed Consolidated Statements of Operations The following table presents the pre-tax effects of derivative instruments designated as cash flow hedges on accumulated other comprehensive income and the condensed consolidated statements of operations for the three and six months ended September 30, 2015 and 2016 : Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Gain (loss) included in AOCI as of beginning of period $ 102 $ 415 $ 5,705 $ (1,106 ) Amount of gain (loss) recognized in other comprehensive income (“OCI”) (effective portion) (1,976 ) (650 ) (4,814 ) 304 Amount of gain (loss) reclassified from OCI into net revenues (effective portion) 2,197 825 5,735 985 Amount of gain (loss) reclassified from OCI into cost of revenues (effective portion) (1,171 ) (589 ) (1,944 ) (1,316 ) Total amount of gain (loss) reclassified from AOCI to income (loss) (effective portion) 1,026 236 3,791 (331 ) Gain included in AOCI as of end of period $ (2,900 ) $ (471 ) $ (2,900 ) $ (471 ) During the three and six months ended September 30, 2015 and 2016 the Company recognized an immaterial gain on the ineffective portion of its cash flow hedges, which is reported in other non-operating income and (expense), net in the condensed consolidated statements of operations.

INCOME TAXES

INCOME TAXES	6 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company and its subsidiaries are subject to taxation in the U.S. and in various foreign and state jurisdictions. The effective tax rates for the three and six months ended September 30, 2015 were 27.4% and 23.2% , respectively compared to 21.4% and 22.0% , respectively for the three and six months ended September 30, 2016 . The decrease in the effective tax rate for the three months ended September 30, 2016 is due primarily to the federal research and development credit, which was permanently reinstated in December 2015, as well as a shift in our geographic mix of income from higher tax jurisdictions to lower tax jurisdictions due in part to the U.S. executive transition costs accrued during the three months ended September 30, 2016 . The decrease in the effective tax rate for the six months ended September 30, 2016 is due primarily to the federal research and development credit and a shift in our geographic mix of income from higher tax jurisdictions to lower tax jurisdictions, partially offset by the favorable closure of a tax audit during the six months ended September 30, 2015 . The effective tax rates differ from the statutory rate due primarily to the impact of foreign operations taxed at different statutory rates, tax credits, state taxes, and other factors. Included in long-term income taxes payable in the condensed consolidated balance sheets as of March 31, 2016 and September 30, 2016 were unrecognized tax benefits of $12.7 million and $13.6 million , respectively, which would favorably impact the effective tax rate in future periods if recognized. The Company’s continuing practice is to recognize interest and/or penalties related to income tax matters in income tax expense in the condensed consolidated statements of operations. The accrued interest related to unrecognized tax benefits was $1.6 million and $1.8 million as of March 31, 2016 and September 30, 2016 , respectively. No penalties have been accrued. The Company and its subsidiaries are subject to taxation in the U.S. and various foreign and state jurisdictions. All U.S. federal tax matters have been concluded for tax years prior to fiscal year 2013. The California Franchise Tax Board completed its examination of the Company's 2007 and 2008 tax years. The Company received a Notice of Proposed Assessment and responded by filing a protest letter. The amount of the proposed assessment is not material. Foreign income tax matters for material tax jurisdictions have been concluded for tax years prior to fiscal year 2011, except for the United Kingdom, which has been concluded for tax years prior to fiscal year 2015. The Company believes that an adequate provision has been made for any adjustments that may result from tax examinations; however, the outcome of such examinations cannot be predicted with certainty. If any issues addressed in the tax examinations are resolved in a manner inconsistent with the Company's expectations, the Company could be required to adjust its provision for income tax in the period such resolution occurs. The timing of any resolution and/or closure of tax examinations is not certain.

COMPUTATION OF EARNINGS PER COM

COMPUTATION OF EARNINGS PER COMMON SHARE	6 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
COMPUTATION OF EARNINGS PER COMMON SHARE	COMPUTATION OF EARNINGS PER COMMON SHARE The Company has a share-based compensation plan under which employees, non-employee directors, and consultants may be granted share-based awards, including shares of restricted stock on which non-forfeitable dividends are paid on unvested shares. As such, shares of restricted stock are considered participating securities under the two-class method of calculating earnings per share. The two-class method of calculating earnings per share did not have a material impact on the Company's earnings per share calculation for the three and six month periods ending September 30, 2015 and 2016 . The following table sets forth the computation of basic and diluted earnings per common share for the three and six months ended September 30, 2015 and 2016 : Three Months Ended Six Months Ended (in thousands, except per share data) 2015 2016 2015 2016 Numerator: Net income $ 17,896 $ 20,474 $ 39,124 $ 40,861 Denominator: Weighted average common shares-basic 33,590 32,281 35,796 32,269 Dilutive effect of employee equity incentive plans 655 445 880 596 Weighted average common shares-diluted 34,245 32,726 36,676 32,865 Basic earnings per common share $ 0.53 $ 0.63 $ 1.09 $ 1.27 Diluted earnings per common share $ 0.52 $ 0.63 $ 1.07 $ 1.24 Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive 283 543 257 634

REVENUE AND MAJOR CUSTOMERS

REVENUE AND MAJOR CUSTOMERS	6 Months Ended
	Sep. 30, 2016
REVENUE AND MAJOR CUSTOMERS [Abstract]
REVENUE AND MAJOR CUSTOMERS	REVENUE AND MAJOR CUSTOMERS The Company designs, manufactures, markets, and sells headsets for business and consumer applications, and other specialty products for the hearing impaired. With respect to headsets, it makes products for use in offices and contact centers and, with mobile devices, cordless phones, computers, and gaming consoles. The following table presents net revenues by product group for the three and six months ended September 30, 2015 and 2016 : Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Net revenues from unaffiliated customers: Enterprise $ 160,468 $ 154,542 $ 312,225 $ 310,439 Consumer 54,549 61,641 109,150 128,850 Total net revenues $ 215,017 $ 216,183 $ 421,375 $ 439,289 For reporting purposes, revenue is attributed to each geographic region based on the location of the customer. Other than the U.S., no country accounted for 10% or more of the Company's net revenues for the three and six months ended September 30, 2015 and 2016 . The following table presents net revenues by geography: Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Net revenues from unaffiliated customers: U.S. $ 123,803 $ 119,062 $ 241,381 $ 247,300 Europe and Africa 51,718 51,422 101,825 105,489 Asia Pacific 28,219 28,588 54,734 54,815 Americas, excluding U.S. 11,277 17,111 23,435 31,685 Total international net revenues 91,214 97,121 179,994 191,989 Total net revenues $ 215,017 $ 216,183 $ 421,375 $ 439,289 One customer, Ingram Micro Group, accounted for 10.9% of net revenues for the three months ended September 30, 2015 . No customer accounted for more than 10% of net revenues for the six months ended September 30, 2015 . One customer, Ingram Micro Group, accounted for 10.7% and 10.4% , respectively, of net revenues for the three and six months ended September 30, 2016 , respectively. One customer, SYNNEX Corporation, accounted for 11.2% of total net accounts receivable at March 31, 2016 . One customer, Ingram Micro Group, accounted for 10.5% of total net accounts receivable at September 30, 2016 .

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	6 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On November 1, 2016 , the Company announced that its Audit Committee had declared and approved the payment of a dividend of $0.15 per share on December 9, 2016 to holders of record on November 18, 2016 .

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	6 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	In the opinion of management, the accompanying unaudited condensed consolidated financial statements ("financial statements") of Plantronics, Inc. ("Plantronics" or "the Company") have been prepared on a basis consistent with the Company's March 31, 2016 audited consolidated financial statements and include all adjustments, consisting of normal recurring adjustments, necessary to fairly state the information set forth herein. Certain information and footnote disclosures normally included in financial statements prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC") applicable to interim financial information and in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") have been condensed or omitted pursuant to such rules and regulations. The financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2016 , which was filed with the SEC on May 16, 2016 . The results of operations for the interim period ended September 30, 2016 are not necessarily indicative of the results to be expected for the entire fiscal year or any future period. The financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.
Fiscal period	The Company’s fiscal year ends on the Saturday closest to the last day of March. The Company’s current fiscal year ends on April 1, 2017 and consists of 52 weeks. The Company's prior fiscal year ended on April 2, 2016 and consisted of 53 weeks. The Company’s results of operations for the three and six months ended October 1, 2016 and September 26, 2015 both contain 13 and 26 weeks, respectively. For purposes of presentation, the Company has indicated its accounting year as ending on March 31 and its interim quarterly periods as ending on the applicable calendar month end.

CASH, CASH EQUIVALENTS, AND I22

CASH, CASH EQUIVALENTS, AND INVESTMENTS (Tables)	6 Months Ended
	Sep. 30, 2016
CASH, CASH EQUIVALENTS AND INVESTMENTS [Abstract]
Cash, Cash Equivalents, and Investments	The following tables summarize the Company’s cash and available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category recorded as cash and cash equivalents, short-term, or long-term investments as of September 30, 2016 and March 31, 2016 (in thousands): September 30, 2016 Amortized Gross Gross Fair Cash & Cash Equivalents Short-term investments (due in 1 year or less) Long-term investments (due in 1 to 3 years) Cash $ 236,361 $ — $ — $ 236,361 $ 236,361 $ — $ — Level 1: Mutual Funds 11,399 198 (53 ) 11,544 — 11,544 — US Treasury Notes 20,534 24 (4 ) 20,554 — 11,974 8,580 Subtotal 31,933 222 (57 ) 32,098 — 23,518 8,580 Level 2: Government Agency Securities 55,039 29 (11 ) 55,057 — 12,239 42,818 Commercial Paper 58,506 — — 58,506 8,094 50,412 — Corporate Bonds 148,547 216 (66 ) 148,697 — 73,110 75,587 Certificates of Deposits ("CDs") 22,916 — — 22,916 — 19,206 3,710 Subtotal 285,008 245 (77 ) 285,176 8,094 154,967 122,115 Total cash, cash equivalents $ 553,302 $ 467 $ (134 ) $ 553,635 $ 244,455 $ 178,485 $ 130,695 March 31, 2016 Amortized Gross Gross Fair Cash & Cash Equivalents Short-term investments (due in 1 year or less) Long-term investments (due in 1 to 3 years) Cash $ 232,600 $ — $ — $ 232,600 $ 232,600 $ — $ — Level 1: Mutual Funds 10,025 32 (548 ) 9,509 — 9,509 — US Treasury Notes 25,051 21 (9 ) 25,063 — 12,993 12,070 Subtotal 35,076 53 (557 ) 34,572 — 22,502 12,070 Level 2: Government Agency Securities 72,698 24 (20 ) 72,702 — 10,521 62,181 Commercial Paper 37,628 — — 37,628 650 36,978 — Corporate Bonds 147,662 234 (97 ) 147,799 2,016 77,115 68,668 Certificates of Deposits ("CDs") 15,639 — — 15,639 — 12,935 2,704 Subtotal 273,627 258 (117 ) 273,768 2,666 137,549 133,553 Total cash, cash equivalents $ 541,303 $ 311 $ (674 ) $ 540,940 $ 235,266 $ 160,051 $ 145,623

DETAILS OF CERTAIN BALANCE SH23

DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS (Tables)	6 Months Ended
	Sep. 30, 2016
Balance Sheet Related Disclosures [Abstract]
Accounts receivable, net	Accounts receivable, net: March 31, September 30, (in thousands) 2016 2016 Accounts receivable $ 163,834 $ 174,141 Provisions for returns (7,314 ) (8,559 ) Provisions for promotions, rebates, and other (27,737 ) (28,095 ) Provisions for doubtful accounts and sales allowances (564 ) (708 ) Accounts receivable, net $ 128,219 $ 136,779
Inventory, net	Inventory, net: March 31, September 30, (in thousands) 2016 2016 Raw materials $ 21,612 $ 23,858 Work in process 527 345 Finished goods 31,023 28,483 Inventory, net $ 53,162 $ 52,686
Accrued liabilities	Accrued Liabilities: March 31, September 30, (in thousands) 2016 2016 Employee compensation and benefits $ 22,955 $ 28,044 Accrued interest on 5.50% Senior Notes 10,501 10,387 Warranty obligation 8,537 8,540 VAT/Sales tax payable 4,894 5,143 Restructuring and other related charges 5,783 401 Accrued other 17,364 18,937 Accrued liabilities $ 70,034 $ 71,452
Changes in the warranty obligation	Changes in the warranty obligation during the six months ended September 30, 2015 and 2016 were as follows: Six Months Ended (in thousands) 2015 2016 Warranty obligation at beginning of period $ 7,717 $ 8,537 Warranty provision related to products shipped 4,520 4,649 Deductions for warranty claims processed (4,257 ) (4,742 ) Adjustments related to preexisting warranties 193 96 Warranty obligation at end of period $ 8,173 $ 8,540

DEBT (Tables)

DEBT (Tables)	6 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Summary of debt, fair value	The fair value of the 5.50% Senior Notes was determined based on inputs that were observable in the market, including the trading price of the 5.50% Senior Notes when available (Level 2). The estimated fair value and carrying value of the 5.50% Senior Notes were as follows: March 31, 2016 September 30, 2016 (in thousands) Fair Value Carrying Value Fair Value Carrying Value 5.50% Senior Notes $ 493,440 $ 489,609 $ 517,500 $ 490,334
Summary of debt redemption	The Company may redeem all or a part of the 5.50% Senior Notes, upon not less than 30 or more than a 60 day notice; however, the applicable redemption price will be determined as follows: Redemption Period Requiring Payment of: Redemption Up To 35% Using Cash Proceeds From An Equity Offering (3) : Make-Whole (1) Premium (2) Date Specified Price 5.50% Senior Notes Prior to May 15, 2018 On or after May 15, 2018 Prior to May 15, 2018 105.500% (1) If the Company redeems the notes prior to the applicable date, the redemption price is principal plus a make-whole premium equal to the present value of the remaining scheduled interest payments as described in the applicable indenture, together with accrued and unpaid interest. (2) If the Company redeems the notes on or after the applicable date, the price is principal plus a premium which declines over time as specified in the applicable indenture, together with accrued and unpaid interest. (3) If the Company redeems the notes prior to the applicable date with net cash proceeds of one or more equity offerings, the price is equal to the amount specified above, together with accrued and unpaid interest, subject to a maximum redemption of 35% of the aggregate principal amount of the respective note being redeemed.

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	6 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Expense Included in Statements of Operations	The following table summarizes the amount of stock-based compensation included in the condensed consolidated statements of operations: Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Cost of revenues $ 879 $ 778 $ 1,658 $ 1,620 Research, development, and engineering 2,619 2,408 4,978 4,892 Selling, general, and administrative 5,334 4,717 10,246 9,804 Stock-based compensation included in operating expenses 7,953 7,125 15,224 14,696 Total stock-based compensation 8,832 7,903 16,882 16,316 Income tax benefit (2,642 ) (2,877 ) (4,964 ) (5,649 ) Total stock-based compensation, net of tax $ 6,190 $ 5,026 $ 11,918 $ 10,667

ACCUMULATED OTHER COMPREHENSI26

ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)	6 Months Ended
	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income ("AOCI"), net of immaterial tax effects, are as follows: (in thousands) March 31, 2016 September 30, 2016 Accumulated unrealized gain (loss) on cash flow hedges (1) $ (1,087 ) $ (469 ) Accumulated foreign currency translation adjustments 4,739 4,489 Accumulated unrealized gain (loss) on investments 107 140 Accumulated other comprehensive income $ 3,759 $ 4,160 (1) Refer to Note 11 , Foreign Currency Derivatives, which discloses the nature of the Company's derivative assets and liabilities as of March 31, 2016 and September 30, 2016 .

FOREIGN CURRENCY DERIVATIVES (T

FOREIGN CURRENCY DERIVATIVES (Tables)	6 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Outstanding Derivative Contracts	The gross fair value of the Company's outstanding derivative contracts at the end of each period was as follows: (in thousands) March 31, 2016 September 30, 2016 Derivative Assets (recorded in 'Other current assets') Non-designated hedges $ 33 $ 182 Cash flow hedges 1,952 2,524 Total Derivative Assets $ 1,985 $ 2,706 Derivative Liabilities (recorded in 'Accrued liabilities') Non-designated hedges $ 1,163 $ 79 Cash flow hedges 3,255 2,655 Total Derivative Liabilities $ 4,418 $ 2,734
Notional Value of Outstanding Foreign Exchange Currency Contracts	The following table summarizes the notional value of the Company’s outstanding foreign exchange currency contracts and approximate U.S. Dollar ("USD") equivalent at September 30, 2016 : (in thousands) Local Currency USD Equivalent Position Maturity EUR € 33,000 $ 37,143 Sell EUR 1 month GBP £ 7,600 $ 9,893 Sell GBP 1 month AUD A$ 13,800 $ 10,569 Sell AUD 1 month CAD C$ 2,230 $ 1,699 Sell CAD 1 month
Effect of Non-Designated Derivative Contracts Recognized in Interest and Other Income, Net	The effect of non-designated derivative contracts recognized in other non-operating income and (expense), net in the condensed consolidated statements of operations was as follows: Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Gain (loss) on foreign exchange contracts $ 1,276 $ (193 ) $ 148 $ 1,750
Notional Value of Outstanding Cross-Currency Swaps	The following table summarizes the notional value of the Company’s outstanding MXN cross-currency swaps and approximate USD Equivalent at September 30, 2016 : (in thousands) Local Currency USD Equivalent Position Maturity MXN 491,790 $ 26,779 Buy MXN Monthly over 21 months
Reclassification out of Accumulated Other Comprehensive Income	The following table presents the pre-tax effects of derivative instruments designated as cash flow hedges on accumulated other comprehensive income and the condensed consolidated statements of operations for the three and six months ended September 30, 2015 and 2016 : Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Gain (loss) included in AOCI as of beginning of period $ 102 $ 415 $ 5,705 $ (1,106 ) Amount of gain (loss) recognized in other comprehensive income (“OCI”) (effective portion) (1,976 ) (650 ) (4,814 ) 304 Amount of gain (loss) reclassified from OCI into net revenues (effective portion) 2,197 825 5,735 985 Amount of gain (loss) reclassified from OCI into cost of revenues (effective portion) (1,171 ) (589 ) (1,944 ) (1,316 ) Total amount of gain (loss) reclassified from AOCI to income (loss) (effective portion) 1,026 236 3,791 (331 ) Gain included in AOCI as of end of period $ (2,900 ) $ (471 ) $ (2,900 ) $ (471 )

COMPUTATION OF EARNINGS PER C28

COMPUTATION OF EARNINGS PER COMMON SHARE (Tables)	6 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Common Share	The following table sets forth the computation of basic and diluted earnings per common share for the three and six months ended September 30, 2015 and 2016 : Three Months Ended Six Months Ended (in thousands, except per share data) 2015 2016 2015 2016 Numerator: Net income $ 17,896 $ 20,474 $ 39,124 $ 40,861 Denominator: Weighted average common shares-basic 33,590 32,281 35,796 32,269 Dilutive effect of employee equity incentive plans 655 445 880 596 Weighted average common shares-diluted 34,245 32,726 36,676 32,865 Basic earnings per common share $ 0.53 $ 0.63 $ 1.09 $ 1.27 Diluted earnings per common share $ 0.52 $ 0.63 $ 1.07 $ 1.24 Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive 283 543 257 634

REVENUE AND MAJOR CUSTOMERS (Ta

REVENUE AND MAJOR CUSTOMERS (Tables)	6 Months Ended
	Sep. 30, 2016
REVENUE AND MAJOR CUSTOMERS [Abstract]
Net Revenues by Product Group	The following table presents net revenues by product group for the three and six months ended September 30, 2015 and 2016 : Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Net revenues from unaffiliated customers: Enterprise $ 160,468 $ 154,542 $ 312,225 $ 310,439 Consumer 54,549 61,641 109,150 128,850 Total net revenues $ 215,017 $ 216,183 $ 421,375 $ 439,289
Net Revenues by Geography	The following table presents net revenues by geography: Three Months Ended Six Months Ended (in thousands) 2015 2016 2015 2016 Net revenues from unaffiliated customers: U.S. $ 123,803 $ 119,062 $ 241,381 $ 247,300 Europe and Africa 51,718 51,422 101,825 105,489 Asia Pacific 28,219 28,588 54,734 54,815 Americas, excluding U.S. 11,277 17,111 23,435 31,685 Total international net revenues 91,214 97,121 179,994 191,989 Total net revenues $ 215,017 $ 216,183 $ 421,375 $ 439,289

CASH, CASH EQUIVALENTS, AND I30

CASH, CASH EQUIVALENTS, AND INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 244,455	$ 235,266	$ 304,836	$ 276,850
Short-term investments (due in 1 year or less)	178,485	160,051
Long-term investments (due in 1 to 3 years)	130,695	145,623
Total cash, cash equivalents and investments measured at fair value, amortized cost	553,302	541,303
Total cash, cash equivalents and investments measured at fair value, gross unrealized gains	467	311
Total cash, cash equivalents and investments measured at fair value, gross unrealized losses	(134)	(674)
Total cash, cash equivalents and investments measured at fair value, fair value	553,635	540,940
Cash [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	236,361	232,600
Level 1 [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Available-for-sale Securities, amortized cost basis	31,933	35,076
Available-for-sale Securities, gross unrealized gains	222	53
Available-for-sale Securities, gross unrealized losses	(57)	(557)
Available-for-sale Securities, fair value	32,098	34,572
Short-term investments (due in 1 year or less)	23,518	22,502
Long-term investments (due in 1 to 3 years)	8,580	12,070
Level 1 [Member] | Mutual Funds [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Available-for-sale Securities, amortized cost basis	11,399	10,025
Available-for-sale Securities, gross unrealized gains	198	32
Available-for-sale Securities, gross unrealized losses	(53)	(548)
Available-for-sale Securities, fair value	11,544	9,509
Short-term investments (due in 1 year or less)	11,544	9,509
Long-term investments (due in 1 to 3 years)	0	0
Level 1 [Member] | US Treasury Notes [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Available-for-sale Securities, amortized cost basis	20,534	25,051
Available-for-sale Securities, gross unrealized gains	24	21
Available-for-sale Securities, gross unrealized losses	(4)	(9)
Available-for-sale Securities, fair value	20,554	25,063
Short-term investments (due in 1 year or less)	11,974	12,993
Long-term investments (due in 1 to 3 years)	8,580	12,070
Level 2 [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	8,094	2,666
Available-for-sale Securities, amortized cost basis	285,008	273,627
Available-for-sale Securities, gross unrealized gains	245	258
Available-for-sale Securities, gross unrealized losses	(77)	(117)
Available-for-sale Securities, fair value	285,176	273,768
Short-term investments (due in 1 year or less)	154,967	137,549
Long-term investments (due in 1 to 3 years)	122,115	133,553
Level 2 [Member] | Government Agency Securities [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Available-for-sale Securities, amortized cost basis	55,039	72,698
Available-for-sale Securities, gross unrealized gains	29	24
Available-for-sale Securities, gross unrealized losses	(11)	(20)
Available-for-sale Securities, fair value	55,057	72,702
Short-term investments (due in 1 year or less)	12,239	10,521
Long-term investments (due in 1 to 3 years)	42,818	62,181
Level 2 [Member] | Commercial Paper [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	8,094	650
Available-for-sale Securities, amortized cost basis	58,506	37,628
Available-for-sale Securities, gross unrealized gains	0	0
Available-for-sale Securities, gross unrealized losses	0	0
Available-for-sale Securities, fair value	58,506	37,628
Short-term investments (due in 1 year or less)	50,412	36,978
Long-term investments (due in 1 to 3 years)	0	0
Level 2 [Member] | Corporate Bonds [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	2,016
Available-for-sale Securities, amortized cost basis	148,547	147,662
Available-for-sale Securities, gross unrealized gains	216	234
Available-for-sale Securities, gross unrealized losses	(66)	(97)
Available-for-sale Securities, fair value	148,697	147,799
Short-term investments (due in 1 year or less)	73,110	77,115
Long-term investments (due in 1 to 3 years)	75,587	68,668
Level 2 [Member] | Certificates of Deposit [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Available-for-sale Securities, amortized cost basis	22,916	15,639
Available-for-sale Securities, gross unrealized gains	0	0
Available-for-sale Securities, gross unrealized losses	0	0
Available-for-sale Securities, fair value	22,916	15,639
Short-term investments (due in 1 year or less)	19,206	12,935
Long-term investments (due in 1 to 3 years)	$ 3,710	$ 2,704

DEFERRED COMPENSATION (Details)

DEFERRED COMPENSATION (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Bank deposits held	$ 244,455	$ 235,266	$ 304,836	$ 276,850
Short-term investments [Member] | Mutual Funds [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Investments	11,500	9,500
Other long-term liabilities [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation liability, noncurrent	12,800	$ 10,700
Bank Time Deposits [Member] | Cash and Cash Equivalents [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Bank deposits held	$ 800

DETAILS OF CERTAIN BALANCE SH32

DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Accounts Receivable, net (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Accounts receivable, net [Line Items]
Accounts receivable	$ 174,141	$ 163,834
Accounts receivable, net	136,779	128,219
Provision for returns [Member]
Accounts receivable, net [Line Items]
Accounts receivable, reserves	(8,559)	(7,314)
Provision for promotions, rebates and other [Member]
Accounts receivable, net [Line Items]
Accounts receivable, reserves	(28,095)	(27,737)
Provisions for doubtful accounts and sales allowances [Member]
Accounts receivable, net [Line Items]
Accounts receivable, reserves	$ (708)	$ (564)

DETAILS OF CERTAIN BALANCE SH33

DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Inventory, net (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Inventory, Net [Abstract]
Raw materials	$ 23,858	$ 21,612
Work in process	345	527
Finished goods	28,483	31,023
Inventory, net	$ 52,686	$ 53,162

DETAILS OF CERTAIN BALANCE SH34

DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	May 31, 2015	Mar. 31, 2015
Accrued Liabilities [Abstract]
Employee compensation and benefits	$ 28,044	$ 22,955
Accrued interest on 5.50% Senior Notes	10,387	10,501
Warranty obligation	8,540	8,537	$ 8,173		$ 7,717
VAT/Sales tax payable	5,143	4,894
Restructuring and other related charges	401	5,783
Accrued other	18,937	17,364
Accrued liabilities	$ 71,452	$ 70,034
5.50% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument	5.50%			5.50%

DETAILS OF CERTAIN BALANCE SH35

DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Warranty Obligation (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Changes in the Warranty Obligation [Roll Forward]
Warranty obligation at beginning of period	$ 8,537	$ 7,717
Warranty provision related to products shipped	4,649	4,520
Deductions for warranty claims processed	(4,742)	(4,257)
Adjustments related to preexisting warranties	96	193
Warranty obligation at end of period	$ 8,540	$ 8,173

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	Sep. 01, 2016	Jul. 06, 2016	Nov. 06, 2016	Sep. 30, 2016
Loss Contingencies [Line Items]
Unconditional purchase obligations				$ 173.2
GN Netcom, Inc. vs. Plantronics, Inc. [Member]
Loss Contingencies [Line Items]
Punitive sanctions awarded against Plantronics, Inc.		$ 3
Accrued amounts				5
GN Netcom, Inc. vs. Plantronics, Inc. [Member] | Punitive Sanctions [Member]
Loss Contingencies [Line Items]
Accrued amounts				3
Payment of punitive damages	$ 3
GN Netcom, Inc. vs. Plantronics, Inc. [Member] | Estimate of Fees and Costs Incurred [Member]
Loss Contingencies [Line Items]
Accrued amounts				$ 2
Expected payment [Member] | GN Netcom, Inc. vs. Plantronics, Inc. [Member] | Punitive Sanctions [Member]
Loss Contingencies [Line Items]
Payment of punitive damages			$ 1.9

DEBT (Details)

DEBT (Details) - USD ($)	May 02, 2016	May 09, 2011	May 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
Debt Disclosure [Line Items]
Proceeds from issuance of senior notes, net of issuance costs						$ 0	$ 488,401,000
Latest amendment date of Credit Agreement	May 2, 2016
Initiation date of credit agreement		May 9, 2011
Credit facility expiration date						May 9, 2019
Commitment fee percentage						0.37%
Outstanding borrowings under line of credit				$ 0		$ 0		$ 0
Minimum required liquid funds						300,000,000
Restructuring charges/adjustments				$ (415,000)	$ 0	$ (1,463,000)	$ 0	16,200,000
Line Of Credit Facility Interest Rate Spread Below The Banks Announced Prime Rate [Member]
Debt Disclosure [Line Items]
Spread for interest rate						1.20%
Line Of Credit Facility Interest Rate Spread Above A Daily One Month LIBOR Rate [Member]
Debt Disclosure [Line Items]
Spread for interest rate						1.40%
Senior Notes [Member] | 5.50% Senior Notes [Member]
Debt Disclosure [Line Items]
Principal amount of debt issued			$ 500,000,000
Stated interest rate of debt instrument			5.50%	5.50%		5.50%
Proceeds from issuance of senior notes, net of issuance costs			$ 488,400,000
Debt issuance costs			$ 11,600,000
Debt redemption percentage price, Specified Price			105.50%
Repurchase price, percentage of principal amount			101.00%
Minimum [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]
Debt Disclosure [Line Items]
Debt redemption notice period			30 days
Maximum [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]
Debt Disclosure [Line Items]
Debt redemption notice period			60 days
Percentage of debt redeemed			35.00%
Level 2 [Member] | Fair Value [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]
Debt Disclosure [Line Items]
Long-term debt, 5.50% Senior Notes				$ 517,500,000		$ 517,500,000		493,440,000
Level 2 [Member] | Carrying Value [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]
Debt Disclosure [Line Items]
Long-term debt, 5.50% Senior Notes				$ 490,334,000		$ 490,334,000		$ 489,609,000
Revolving Credit Facility [Member]
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 7,903	$ 8,832	$ 16,316	$ 16,882
Income tax benefit	(2,877)	(2,642)	(5,649)	(4,964)
Total stock-based compensation, net of tax	5,026	6,190	10,667	11,918
Cost of revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	778	879	1,620	1,658
Research, development, and engineering [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	2,408	2,619	4,892	4,978
Selling, general, and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	4,717	5,334	9,804	10,246
Stock-based compensation expense included in operating expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 7,125	$ 7,953	$ 14,696	$ 15,224

COMMON STOCK REPURCHASES (Detai

COMMON STOCK REPURCHASES (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Remaining shares authorized for repurchase under program	1,020,990
Shares repurchased	613,021	8,492,117
Total cost of shares repurchased	$ 26,828	$ 473,220
Average cost per share of shares repurchased	$ 43.76	$ 55.72
Value of shares withheld in satisfaction of employee tax withholding obligations	$ 9,123	$ 10,499

ACCUMULATED OTHER COMPREHENSI40

ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated unrealized gain (loss) on cash flow hedges	[1]	$ (469)	$ (1,087)
Accumulated foreign currency translation adjustments		4,489	4,739
Accumulated unrealized gain (loss) on investments		140	107
Accumulated other comprehensive income		$ 4,160	$ 3,759
[1]	Refer to Note 11, Foreign Currency Derivatives, which discloses the nature of the Company's derivative assets and liabilities as of March 31, 2016 and September 30, 2016.

FORIEGN CURRENCY DERIVATIVES (D

FORIEGN CURRENCY DERIVATIVES (Details) MXN in Thousands, $ in Thousands	6 Months Ended
	Sep. 30, 2016USD ($)financial_institution	Sep. 30, 2016MXNfinancial_institution	Mar. 31, 2016MXN
Derivative [Line Items]
Number of financial institutions company has International Swap and Derivatives Association agreements | financial_institution	4	4
Foreign currency option, loss expected to be reclassified during the next 12 months | $	$ 1,700
Foreign currency swap contract [Member]
Derivative [Line Items]
Notional amount of contracts	$ 26,779	MXN 491,790	MXN 481,000
Cash flow hedges [Member] | Options [Member] | Minimum [Member]
Derivative [Line Items]
Derivative, Term of Contract	6 months
Cash flow hedges [Member] | Options [Member] | Maximum [Member]
Derivative [Line Items]
Derivative, Term of Contract	11 months
Cash flow hedges [Member] | Forwards [Member]
Derivative [Line Items]
Derivative, Term of Contract	3 months

FOREIGN CURRENCY DERIVATIVES (D

FOREIGN CURRENCY DERIVATIVES (Details 1) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Other Current Assets [Member]
Derivative [Line Items]
Total Derivative Assets	$ 2,706	$ 1,985
Other Current Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total Derivative Assets	182	33
Other Liabilities [Member]
Derivative [Line Items]
Total Derivative Liabilities	2,734	4,418
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total Derivative Liabilities	79	1,163
Cash flow hedges [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total Derivative Assets	2,524	1,952
Cash flow hedges [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total Derivative Liabilities	$ 2,655	$ 3,255

FOREIGN CURRENCY DERIVATIVES 43

FOREIGN CURRENCY DERIVATIVES (Details 2) - 6 months ended Sep. 30, 2016 € in Thousands, £ in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands	EUR (€)	CAD	GBP (£)	AUD	USD ($)
Foreign Exchange Forward, EURO [Member]
Derivative [Line Items]
Notional amount of contracts	€ 33,000				$ 37,143
Position	Sell EUR
Maturity	1 month
Foreign Exchange Forward, GBP [Member]
Derivative [Line Items]
Notional amount of contracts			£ 7,600		9,893
Position	Sell GBP
Maturity	1 month
Foreign Exchange Forward, AUD [Member]
Derivative [Line Items]
Notional amount of contracts				AUD 13,800	10,569
Position	Sell AUD
Maturity	1 month
Foreign Exchange Forward, CAD [Member]
Derivative [Line Items]
Notional amount of contracts		CAD 2,230			$ 1,699
Position	Sell CAD
Maturity	1 month

FOREIGN CURRENCY DERIVATIVES 44

FOREIGN CURRENCY DERIVATIVES (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) on foreign exchange contracts	$ (193)	$ 1,276	$ 1,750	$ 148

FOREIGN CURRENCY DERIVATIVES 45

FOREIGN CURRENCY DERIVATIVES (Details 4) € in Millions, £ in Millions	Sep. 30, 2016EUR (€)	Sep. 30, 2016GBP (£)	Mar. 31, 2016EUR (€)	Mar. 31, 2016GBP (£)
Foreign Exchange Option [Member]
Derivative [Line Items]
Notional amount of contracts	€ 61	£ 20	€ 59.4	£ 18.4
Foreign Exchange Forward [Member]
Derivative [Line Items]
Notional amount of contracts	€ 26.5	£ 4.6	€ 23.9	£ 9.1

FOREIGN CURRENCY DERIVATIVES 46

FOREIGN CURRENCY DERIVATIVES (Details 5) - Foreign currency swap contract [Member] MXN in Thousands, $ in Thousands	6 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2016MXN	Mar. 31, 2016MXN
Derivative [Line Items]
Notional amount of contracts	$ 26,779	MXN 491,790	MXN 481,000
Derivative, Currency Bought	Buy MXN
Maturity	21 months

FOREIGN CURRENCY DERIVATIVES 47

FOREIGN CURRENCY DERIVATIVES (Details 6) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Gain (Loss) Included in Accumulated Other Comprehensive Income [Roll Forward]
Gain (loss) included in AOCI as of beginning of period	$ 415	$ 102	$ (1,106)	$ 5,705
Amount of gain (loss) recognized in other comprehensive income (“OCI”) (effective portion)	(650)	(1,976)	304	(4,814)
Amount of gain (loss) reclassified from OCI into net revenues (effective portion)	216,183	215,017	439,289	421,375
Amount of gain (loss) reclassified from OCI into cost of revenues (effective portion)	(105,737)	(104,047)	(215,770)	(203,047)
Total amount of gain (loss) reclassified from AOCI to income (loss) (effective portion)	236	1,026	(331)	3,791
Gain included in AOCI as of end of period	(471)	(2,900)	(471)	(2,900)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Gain (Loss) Included in Accumulated Other Comprehensive Income [Roll Forward]
Amount of gain (loss) reclassified from OCI into net revenues (effective portion)	825	2,197	985	5,735
Amount of gain (loss) reclassified from OCI into cost of revenues (effective portion)	$ (589)	$ (1,171)	$ (1,316)	$ (1,944)

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016	May 31, 2015
Income Tax Examination [Line Items]
Effective tax rate	21.40%	27.40%	22.00%	23.20%
Unrecognized tax benefits	$ 13,600,000		$ 13,600,000		$ 12,700,000
Accrued interest related to unrecognized tax benefits	1,800,000		1,800,000		1,600,000
Accrued penalties	$ 0		$ 0		$ 0
5.50% Senior Notes [Member] | Senior Notes [Member]
Income Tax Examination [Line Items]
Stated interest rate of debt instrument	5.50%		5.50%			5.50%

COMPUTATION OF EARNINGS PER C49

COMPUTATION OF EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 20,474	$ 17,896	$ 40,861	$ 39,124
Earnings Per Share, Basic and Diluted [Abstract]
Weighted average common shares-basic	32,281	33,590	32,269	35,796
Dilutive effect of employee equity incentive plans	445	655	596	880
Weighted average common shares-diluted	32,726	34,245	32,865	36,676
Basic earnings per common share (in dollars per share)	$ 0.63	$ 0.53	$ 1.27	$ 1.09
Diluted earnings per common share (in dollars per share)	$ 0.63	$ 0.52	$ 1.24	$ 1.07
Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive	543	283	634	257

REVENUE AND MAJOR CUSTOMERS (De

REVENUE AND MAJOR CUSTOMERS (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2016USD ($)Customer	Sep. 30, 2015USD ($)Customer	Sep. 30, 2016USD ($)Customer	Sep. 30, 2015USD ($)Customer	Mar. 31, 2016Customer
Revenue from External Customer [Line Items]
Net revenues	$ 216,183	$ 215,017	$ 439,289	$ 421,375
US [Member]
Revenue from External Customer [Line Items]
Net revenues	119,062	123,803	247,300	241,381
Europe and Africa [Member]
Revenue from External Customer [Line Items]
Net revenues	51,422	51,718	105,489	101,825
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net revenues	28,588	28,219	54,815	54,734
Americas, excluding U.S. [Member]
Revenue from External Customer [Line Items]
Net revenues	17,111	11,277	31,685	23,435
Total international net revenues [Member]
Revenue from External Customer [Line Items]
Net revenues	97,121	91,214	191,989	179,994
Enterprise [Member]
Revenue from External Customer [Line Items]
Net revenues	154,542	160,468	310,439	312,225
Consumer [Member]
Revenue from External Customer [Line Items]
Net revenues	$ 61,641	$ 54,549	$ 128,850	$ 109,150
Net Revenues [Member] | Customer Concentration Risk [Member]
Revenue from External Customer [Line Items]
Number of major customers, ten percent or greater, net revenues | Customer				0
Net Revenues [Member] | Customer Concentration Risk [Member] | Ingram Micro [Member]
Revenue from External Customer [Line Items]
Number of major customers, ten percent or greater, net revenues | Customer	1	1	1
Concentration Risk, Percentage	10.70%	10.90%	10.40%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Ingram Micro [Member]
Revenue from External Customer [Line Items]
Number of major customers, ten percent or greater, net accounts receivable | Customer	1		1
Concentration Risk, Percentage			10.50%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Synnex Corp. [Member]
Revenue from External Customer [Line Items]
Number of major customers, ten percent or greater, net accounts receivable | Customer					1
Concentration Risk, Percentage					11.20%

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - Subsequent Event [Member]	Nov. 01, 2016$ / shares
Subsequent Event [Line Items]
Dividends declared date	Nov. 1, 2016
Cash dividend payable per share	$ 0.15
Dividend payable date	Dec. 9, 2016
Date of stockholders on record for dividends declared	Nov. 18, 2016