Westell (WSTL) 10-Q 1 Aug 14 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Jun. 30, 2014	Jul. 21, 2014	Jul. 21, 2014
		Class A Common Stock	Class B Common Stock
Document Type	'10-Q	'	'
Amendment Flag	'false	'	'
Document Period End Date	30-Jun-14	'	'
Document Fiscal Year Focus	'2015	'	'
Document Fiscal Period Focus	'Q1	'	'
Entity Registrant Name	'WESTELL TECHNOLOGIES INC	'	'
Entity Central Index Key	'0001002135	'	'
Current Fiscal Year End Date	'--03-31	'	'
Entity Filer Category	'Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	46,209,317	13,937,151

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Jun. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$33,689	$35,793
Short-term investments	13,128	15,584
Accounts receivable (net of allowance of $37 and $40 at June 30, 2014, and March 31, 2014, respectively)	16,913	15,831	[1]
Inventories	23,063	24,056	[1]
Prepaid expenses and other current assets	2,220	1,952	[1]
Deferred income taxes	899	899
Assets available-for-sale	1,044	1,044
Total current assets	90,956	95,159	[1]
Property and equipment, gross	18,626	17,902	[1]
Less accumulated depreciation and amortization	-16,220	-16,001
Property and equipment, net	2,406	1,901	[1]
Goodwill	31,682	31,682	[1]
Intangible assets, net	30,307	31,892	[1]
Other non-current assets	350	393
Total assets	155,701	161,027	[1]
Current liabilities:	'	'
Accounts payable	8,205	7,067	[1]
Accrued expenses	3,270	3,418
Accrued compensation	1,821	4,395
Contingent consideration	1,609	2,067
Deferred revenue	1,395	1,774
Total current liabilities	16,300	18,721	[1]
Deferred revenue non-current	740	787
Deferred income tax liability	1,072	1,072
BusinessCombinationContingentConsiderationLiabilityNonCurrent	468	574
Other non-current liabilities	494	528
Total liabilities	19,074	21,682	[1]
Commitments and contingencies (Note 11)	'	'
Stockholdersb equity:	'	'
Preferred stock, par $0.01, Authorized - 1,000,000 shares. Issued and outstanding - none	0	0
Additional paid-in capital	410,857	410,176
Treasury stock at cost b 17,299,059 and 17,130,965 shares at June 30, 2014, and March 31, 2014, respectively	-34,790	-34,206
Cumulative translation adjustment	608	608
Accumulated deficit	-240,648	-237,831	[1]
Total stockholdersb equity	136,627	139,345	[1]
Total liabilities and stockholdersb equity	155,701	161,027	[1]
Class A Common Stock	'	'
Stockholdersb equity:	'	'
Common stock, value	461	459
Class B Common Stock	'	'
Stockholdersb equity:	'	'
Common stock, value	$139	$139
[1]	Certain amounts have been adjusted to reflect measurement period adjustments related to the CSI acquisition.

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2014	Mar. 31, 2014
In Thousands, except Share data, unless otherwise specified
Accounts receivable, allowance	$37	$40
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares	17,299,059	17,130,965
Class A Common Stock	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	109,000,000	109,000,000
Common stock, shares outstanding	46,113,210	45,852,740
Class B Common Stock	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	13,937,151	13,937,151
Common stock, shares outstanding	13,937,151	13,937,151

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013
Income Statement [Abstract]	'		'
Revenue	$27,825		$22,456
Cost of revenue	18,141		14,039	[1]
Gross profit	9,684		8,417	[1]
Operating expenses:	'		'
Sales and marketing	3,421		3,059	[1]
Research and development	4,475		2,699
General and administrative	3,054		3,572
Intangible amortization	1,585		1,622
Restructuring	57		66
Total operating expenses	12,592		11,018	[1]
Operating loss	-2,908		-2,601
Other income (expense), net	61		-130
Loss before income taxes and discontinued operations	-2,847		-2,731
Income tax benefit (expense)	29		-19
Net loss from continuing operations	-2,818		-2,750
Discontinued Operations:	'		'
Loss from discontinued operations, net of tax benefit	'		-14
Net income (loss) (2)	($2,818)	[2]	($2,764)	[2]
Basic net loss per share:	'		'
Basic net loss from continuing operations	($0.05)		($0.05)
Basic net loss from discontinued operations	$0		$0
Basic net loss per share	($0.05)		($0.05)
Diluted net loss per share:	'		'
Diluted net loss from continuing operations	($0.05)		($0.05)
Diluted net loss from discontinued operations	$0		$0
Diluted net loss per share	($0.05)		($0.05)
Weighted-average number of common shares outstanding:	'		'
Basic	59,715		58,521
Effect of dilutive securities: restricted stock, restricted stock units, performance stock units and stock options(3)	0	[3]	0	[3]
Diluted	59,715		58,521
[1]	Certain amounts have been reclassified to reflect a change in accounting principle.
[2]	Net loss and comprehensive loss are the same for the periods reported.
[3]	In periods with a net loss, the basic loss per share equals the diluted loss per share as all common stock equivalents are excluded from the per share calculation.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013
Cash flows from operating activities:	'		'
Net loss	($2,818)	[1]	($2,764)	[1]
Reconciliation of net loss to net cash used in operating activities:	'		'
Depreciation and amortization	1,806		1,775
Stock-based compensation	554		351
Restructuring	57		66
Exchange rate (gain) loss	-27		93
Changes in assets and liabilities:	'		'
Accounts receivable	-1,075		-2,009
Inventories	993		165
Prepaid expenses and other current assets	-269		292
Other assets and liabilities	40		55
Deferred revenue	-425		-1,513
Accounts payable and accrued expenses	1,219		-65
Accrued compensation	-2,574		446
Net cash used in operating activities	-2,519		-3,108
Cash flows from investing activities:	'		'
Maturities of held-to-maturity short-term debt securities	6,440		9,765
Maturities of other short-term investments	'		2,205
Purchases of held-to-maturity short-term debt securities	-3,239		-5,369
Purchases of other short-term investments	-745		-245
Purchases of property and equipment	-723		-83
Acquisitions, net of cash acquired	-304		-28,770
Changes in restricted cash	'		500
Net cash provided by (used in) investing activities	1,429		-21,997
Cash flows from financing activities:	'		'
Purchases of treasury stock	-585		-297
Proceeds from stock options exercised	130		57
Payment of contingent consideration	-575		'
Net cash used in financing activities	-1,030		-240
Gain (loss) of exchange rate changes on cash	16		-17
Net decrease in cash and cash equivalents	-2,104		-25,362
Cash and cash equivalents, beginning of period	35,793		88,233
Cash and cash equivalents, end of period	$33,689		$62,871
[1]	Net loss and comprehensive loss are the same for the periods reported.

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	Description of Business
	Westell Technologies, Inc. (the Company) is a holding company. Its wholly owned subsidiary, Westell, Inc., designs and distributes telecommunications products which are sold primarily to major telephone companies. Noran Tel, Inc. is a wholly owned subsidiary of Westell, Inc. Noran Tel's operations focus on power distribution product development and sales of Westell products in Canada. On April 1, 2013, Westell, Inc. acquired 100% of the outstanding shares of Kentrox, Inc. (Kentrox). Kentrox designed and distributed intelligent site management solutions that provide comprehensive monitoring, management and control of any site. On March 1, 2014, Westell, Inc. acquired 100% of the outstanding shares of Cellular Specialties, Inc. (CSI). CSI designs and develops in-building wireless solutions including distributed antenna systems (DAS) products and small cell connectivity equipment. The assets and liabilities acquired and the results of operations relating to CSI are included in the Company's Condensed Consolidated Financial Statements from the date of acquisition.
	Basis of Presentation and Reporting
	The accompanying Condensed Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries. The Condensed Consolidated Financial Statements have been prepared using generally accepted accounting principles (GAAP) in the United States for interim financial reporting, and consistent with the instructions of Form 10-Q and Article 10 of Regulation S-X, and accordingly they do not include all of the information and footnotes required in the annual consolidated financial statements and accompanying footnotes. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2014. All intercompany accounts and transactions have been eliminated in consolidation.
	In the opinion of management, the unaudited interim financial statements included herein reflect all adjustments, consisting of normal recurring adjustments, necessary to present fairly the Company’s condensed consolidated financial position and the results of operations, comprehensive income (loss) and cash flows at June 30, 2014, and for all periods presented. The results of operations for the periods presented are not necessarily indicative of the results that may be expected for fiscal year 2015.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and that affect revenue and expenses during the periods reported. Estimates are used when accounting for the allowance for uncollectible accounts receivable, net realizable value of inventory, product warranty accrued, relative selling prices, stock-based compensation, goodwill and intangible assets fair value, depreciation, income taxes, and contingencies, among other things. Actual results could differ from those estimates.
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue From Contracts With Customers, that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The ASU is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. The ASU becomes effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period; early adoption is not permitted. The Company is currently assessing the impact that this standard will have on its Consolidated Financial Statements.
	Update to Significant Accounting Policies
	A complete description of the Company’s significant accounting policies is discussed in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2014. There have been no material changes in our critical accounting policies from those disclosed in our Annual Report on Form 10-K for the year ended March 31, 2014, except as set forth below.
	Voluntary Change in Accounting Principle
	Effective April 1, 2014, the Company made a voluntary change in accounting principle to classify shipping and handling costs associated with the distribution of finished product to our customers as cost of revenue (previously recorded in sales and marketing expense). The Company made the voluntary change in principle because it believes the classification of shipping and handling costs in cost of revenue better reflects the cost of producing and distributing products. It also enhances the comparability of the financial statements with many industry peers. As required by U.S. generally accepted accounting principles, the change has been reflected in the Condensed Consolidated Statements of Operations through retrospective application of the change in accounting principle.
	The following table provides the reconciliation from previously reported financial data as adjusted:
		Three months ended June 30, 2013
	(in thousands)	Previously reported			Effect of Accounting Principle Change			Adjusted
	Revenue	$	22,456		$	—		$	22,456
	Cost of revenue	13,680			359			14,039
	Gross profit	$	8,776		$	(359	)	$	8,417
	Gross margin	39.1		%				37.5		%
	Sales and marketing	$	3,418		$	(359	)	$	3,059
	The impact of this change in principle was an increase to cost of revenue and a reduction to sales and marketing expense of $359,000 in the three months ended June 30, 2013. Gross profit and gross profit percentage were reduced accordingly. The amount included in cost of sales in the current period that would have been included in sales and marketing historically, is $255,000 for the three months ended June 2014. The change had no effect on income from continuing operations, net income, earnings per share, or retained earnings for any period.
	Reclassifications
	In addition to the reclassification of shipping and handling costs disclosed above, certain amounts in the Condensed Consolidated Financial Statements for prior periods have been reclassified to reflect measurement period adjustments related to the CSI acquisition (See Note 2).

Acquisitions

Acquisitions	3 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Business Combination Disclosure [Text Block]	'
	Acquisition
	CSI Acquisition
	On March 1, 2014, the Company's wholly-owned subsidiary, Westell, Inc. acquired 100% of the outstanding shares of Cellular Specialties, Inc. (CSI) for a purchase price of $39.0 million in cash plus a $5.0 million working capital adjustment. CSI is an innovator of in-building wireless connectivity solutions for 3G/4G cellular services, enabling coverage anytime, anywhere. ClearLink, CSI’s high performance, low PIM brand of in-building products are designed for distributed antenna systems and small cells. ClearLink products include Universal DAS interface Trays (UDIT), passive DAS interface units, system components, and antennas. CSI’s portfolio also includes digital repeaters and E911 and location-based enhancement solutions for wireless networks.
	The Company incurred $39,000 and $0.2 million of related acquisition costs, which were expensed as incurred and reflected in general and administrative costs in the Condensed Consolidated Statement of Operations for the three months ended June 30, 2014 and twelve months ended March 31, 2014, respectively.
	The results of CSI's operations have been included in the Condensed Consolidated Financial Statements since the date of acquisition and are reported within the In-Building Wireless (IBW) reporting segment (See Note 5). CSI contributed $9.2 million to revenue and $0.2 million to operating loss in three months ended June 30, 2014. Operating loss reflects amortization of intangibles based on the estimated fair value of assets acquired.
	In accordance with the acquisition method of accounting for business combinations, the Company preliminarily allocated the total purchase consideration transferred to identifiable tangible and intangible assets acquired and liabilities assumed at the acquisition date based on each element’s estimated fair value with the remaining unallocated amounts recorded as goodwill. Certain estimated values are not yet finalized and are subject to change, which could be significant. Specifically, amounts for intangible assets, deferred income taxes, inventories and other items are pending finalization of valuation efforts. Purchased intangibles will be amortized over their respective estimated useful lives. Goodwill represents the expected synergies and other benefits from this acquisition that relates to the Company’s market position, customer relationships and supply chain capabilities. Goodwill recorded on the CSI acquisition is not expected to be amortized or deductible for U.S. federal and state income tax purposes. The goodwill from the CSI acquisition is included in the IBW reporting unit.
	The following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed as of the March 1, 2014, acquisition date:
	(in thousands)	Preliminary Amounts Recognized as of Acquisition				Measurement Period Adjustments				Adjusted Preliminary Amounts Recognized
		Date (1)
	Cash	$	6,513			$	—			$	6,513
	Accounts receivable	2,920				(20		)	(c)	2,900
	Inventories	7,625				(242		)	(c)	7,383
	Prepaid expenses and other current assets	158				(23		)	(c)	135
	Property and equipment	816				(45		)	(c)	771
	Intangible assets	16,230				(507		)	(a)	15,723
	Accounts payable, accruals and other liabilities	(2,875		)		(37		)	(c)	(2,912		)
	Income tax payable	(1,175		)		—				(1,175		)
	Deferred income tax liability	(6,616		)		193			(a)	(6,423		)
	Goodwill	20,142				985				21,127
	Total Consideration	$	43,738			$	304		(b)	$	44,042
	(1) As previously reported in the Notes to the Consolidated Financial Statements included in our 2014 Form 10-K.
	(a) Intangible asset fair value adjustment for trade name and related tax effect
	(b) Payment for final working capital adjustment
	(c) Other measurement period adjustments mostly related to inventory adjustments
	Under ASC 805, Business Combinations (ASC 805), the Company is required to recognize adjustments to provisional amounts during the measurement period as they are identified, and to recognize such adjustments retrospectively - as if the accounting for the business combination had been completed at the acquisition date. The March 31, 2014 balance sheet has been adjusted to reflect the measurement period adjustments including the working capital adjustment which was included in accounts payable.
	The following table summarizes the acquired identified intangible assets and the respective fair value and estimated useful life at the date of acquisition:
	(in thousands)		Fair Value				Estimated Life
	Backlog		$	70			1 month
	Customer relationships		10,980				9 years
	Trademark		303				1 year
	Developed technology		3,860				3 years
	Non-compete		510				2 years
	Total intangible assets		$	15,723
	The following unaudited summary information is presented on a consolidated pro forma basis as if the CSI acquisition had occurred on April 1, 2012. The pro forma amounts reflect the accounting effects of the business combination, including the application of the Company's accounting policies, amortization of intangible assets based on the estimated fair value and the impact of other fair value purchase accounting impacts such as inventory valuation step-up. The pro forma results are based on historical information and is not necessarily indicative of the combined results had the acquisition been completed at April 1, 2012, nor are they indicative of future combined results.
	(in thousands)		Three months ended June 30, 2013
	Consolidated pro forma revenue		$	31,374
	Consolidated pro forma operating loss		$	(815	)

Goodwill_and_Intangibles_Notes

Goodwill and Intangibles (Notes)	3 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets Disclosure [Text Block]	'
	Goodwill and Intangible Assets
	The Company has $31.7 million of goodwill from the acquisitions of CSI and Kentrox as of June 30, 2014. The CSI goodwill of $21.1 million is in the IBW reporting unit while the Kentrox goodwill of $10.6 million is in the Communication Solutions Group (CSG) reporting unit. The Company has recorded intangible assets, such as goodwill, trademark, developed technology, non-compete agreements, backlog, and customer relationships, and account for these in accordance with ASC 350 Intangibles-Goodwill and Other (ASC 350). ASC 350 requires an annual test of goodwill and indefinite-lived assets for impairment, unless circumstances dictate more frequent assessments. ASC 350 also requires that intangible assets with determinable lives be amortized over their respective estimated useful lives and reviewed annually for impairment. ASC 350 indicates that if circumstances change or a triggering event were to occur that would indicate impairment, the Company would be required to review intangible assets for impairment and write-downs may be required.
	In evaluating whether it is more likely than not that the fair value of the Company's reporting units were less than their fair value, the Company assessed all relevant events and circumstances and determined that due to the overall financial performance of the CSG segment when compared to prior periods and due to the recent change in the Company's segment reporting, it was necessary that the Company assess whether or not the goodwill and related definite lived intangibles related to the CSG segment were impaired. The Company performed a goodwill impairment test related to the CSG segment and determined that the goodwill was not impaired. In addition, the definite lived intangible assets that relate to the CSG segment were also tested and found not to be impaired.

Restructuring_Charge

Restructuring Charge	3 Months Ended
	Jun. 30, 2014
Restructuring Charges [Abstract]	'
Restructuring Charge	'
	Restructuring Charge
	Kentrox Restructuring
	In the first quarter of fiscal year 2014, the Company acquired Kentrox and identified redundant employees who exited the business after a period of time. The Company recognized restructuring expense of $57,000 and $66,000 in the three months ended June 30, 2014 and 2013, respectively, for severance for these transitional employees. The total cost of this action was approximately $392,000.
	As of June 30, 2014 and March 31, 2014, the unpaid restructuring accrual balance of $40,000 and $57,000, respectively, is presented on the Condensed Consolidated Balance Sheets within Accrued compensation.
	Total restructuring charges and their utilization for the three months ended June 30, 2014 and 2013 are summarized as follows:
		Three months ended June 30, 2014			Three months ended June 30, 2013
	(in thousands)	Employee-related			Employee-related
	Liability at beginning of period	$	57		$	6
	Charged	57			66
	Paid	(74		)	(6		)
	Liability at end of period	$	40		$	66

Interim_Segment_Information

Interim Segment Information	3 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Interim Segment Information	'
	Interim Segment Information
	Westell’s Chief Executive Officer is the chief operating decision maker (CODM). In the first quarter of fiscal 2015, the Company revised its segment reporting structure to realign internal reporting as a result of the full integration of Kentrox into Westell, and the recent CSI acquisition. The CODM continues to define segment profit as gross profit less research and development expenses. In order to provide information that is comparable year to year, fiscal year 2014 segment information has been restated to reflect the new reporting structure. The accounting policies of the segments are the same as those for Westell Technologies, Inc. described in the summary of significant accounting policies.
	The Company’s two reportable segments are as follows:
	Communication Solutions Group (CSG) Segment
	The CSG segment consists of all the intelligent site management, cell site optimization, and outside plant solutions product offerings. CSG segment products and solutions are developed at the Company’s design centers in Dublin, Ohio; Aurora, Illinois; Goleta, California; and Regina, Canada. The CSG operations are managed centrally at the Aurora facility, where products are assembled, tested, packaged, and shipped to customers.
	In-Building Wireless (IBW) Segment
	The IBW segment consists of all the in-building wireless solutions products, which include the comprehensive suite of products and solutions acquired with the addition of CSI, as well as the Westell developed DAS interface panels. IBW segment products and solutions are developed at the Company’s design center in Manchester, New Hampshire. IBW operations are managed centrally at our Manchester facility, where products other than the Westell developed DAS panels, are assembled, tested, packaged, and shipped to customers. The Westell developed DAS panels are assembled, tested, packaged, and shipped from Aurora, Illinois.
	Segment information for the three months ended June 30, 2014, and 2013 is set forth below:
		Three months ended June 30, 2014
	(in thousands)	CSG			IBW			Total
	Revenue	$	13,728		$	14,097		$	27,825
	Cost of revenue	9,855			8,286			18,141
	Gross profit	3,873			5,811			9,684
	Gross margin	28.2		%	41.2		%	34.8		%
	Research and development	2,280			2,195			4,475
	Segment profit	$	1,593		$	3,616		5,209
	Operating expenses:
	Sales and marketing							3,421
	General and administrative							3,054
	Intangible amortization							1,585
	Restructuring							57
	Operating loss							(2,908		)
	Other income (expense)							61
	Income tax benefit (expense)							29
	Net loss from continuing operations							$	(2,818	)
		Three months ended June 30, 2013
	(in thousands)	CSG			IBW			Total
	Revenue	$	21,429		$	1,027		$	22,456
	Cost of revenue	13,307			732			14,039
	Gross profit	8,122			295			8,417
	Gross margin	37.9		%	28.7		%	37.5		%
	Research and development	2,507			192			2,699
	Segment profit	$	5,615		$	103		5,718
	Operating expenses:
	Sales and marketing							3,059
	General and administrative							3,572
	Intangible amortization							1,622
	Restructuring							66
	Operating loss							(2,601		)
	Other income (expense)							(130		)
	Income tax benefit (expense)							(19		)
	Net loss from continuing operations							$	(2,750	)
	Asset information, although available, is not reported to or used by the CODM.

Inventories

Inventories	3 Months Ended
	Jun. 30, 2014
Inventory, Net [Abstract]	'
Inventories	'
	Inventories
	Inventories are stated at the lower of first-in, first-out cost or market value. The components of inventories are as follows:
	(in thousands)	June 30, 2014		31-Mar-14
	Raw materials	$	11,339	$	11,031
	Finished goods and sub-assemblies	11,724		13,025
	Total inventories	$	23,063	$	24,056

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Jun. 30, 2014
Share-based Compensation [Abstract]	'
Stock-Based Compensation	'
	Stock-Based Compensation
	The following table is a summary of total stock-based compensation resulting from stock options, restricted stock, restricted stock units (RSUs) and performance stock units (PSUs), during the three months ended June 30, 2014, and 2013:
		Three months ended June 30,
	(in thousands)	2014			2013
	Stock-based compensation expense	$	554		$	351
	Income tax expense	—			—
	Total stock-based compensation expense after taxes	$	554		$	351
	The stock option, restricted stock and RSUs awarded in the three months ended June 30, 2014, vest in equal annual installments over four years. PSUs earned vest over the performance period, as described below.
	Stock Options
	Stock option activity for the three months ended June 30, 2014 is as follows:
		Shares		Weighted-Average			Weighted-Average	Aggregate
				Exercise Price Per			Remaining	Intrinsic Value (a) (in
				Share			Contractual Term	thousands)
							(in years)
	Outstanding on March 31, 2014	1,835,445		$	2.02		3.7	$	3,110
	Granted	40,000		3.47
	Exercised	(54,300	)	2.39
	Forfeited	(52,500	)	2.43
	Expired	(23,000	)	3.04
	Outstanding on June 30, 2014	1,745,645		$	2.01		3.6	$	952
	(a)	The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the average of the high and low Westell Technologies’ stock price as of the reporting date.
	The weighted-average fair value of stock options granted during the three months ended June 30, 2014, was $1.27 per share.
	Restricted Stock
	The following table sets forth restricted stock activity for the three months ended June 30, 2014:
		Shares		Weighted-Average
				Grant Date Fair
				Value
	Non-vested as of March 31, 2014	407,500		$	1.94
	Granted	80,000		3.83
	Vested	(277,500	)	1.65
	Forfeited	—		—
	Non-vested as of June 30, 2014	210,000		$	3.05
	RSUs
	The following table sets forth the RSU activity for the three months ended June 30, 2014:
		Shares		Weighted-Average
				Grant Date Fair
				Value
	Non-vested as of March 31, 2014	1,679,000		$	3.09
	Granted	217,500		3.83
	Vested	(227,500	)	2.68
	Forfeited	(121,000	)	2.75
	Non-vested as of June 30, 2014	1,548,000		$	3.28
	PSUs
	The PSUs vest in annual increments based on the achievement of pre-established Company performance goals and continued employment. The number of PSUs earned, if any, can range between 0% to 200% of the target amount, depending on actual performance for four fiscal years following the grant date. Upon vesting, the PSUs convert into shares of Class A Common Stock on a one-for-one basis.
	The following table sets forth the PSU activity for the three months ended June 30, 2014:
		Shares		Weighted-Average Grant Date Fair Value
	Non-vested as of March 31, 2014	285,000		$	2.45
	Granted, at target	217,500		3.83
	Vested	(66,764	)	2.45
	Forfeited	(41,801	)	2.93
	Non-vested as of June 30, 2014	393,935		$	3.16

Product_Warranties

Product Warranties	3 Months Ended
	Jun. 30, 2014
Product Warranties Disclosures [Abstract]	'
Product Warranties	'
	Product Warranties
	The Company’s products carry a limited warranty ranging from one to seven years for the products within the CSG segment and one to five years for products within the IBW segment. The specific terms and conditions of those warranties vary depending upon the customer and the products sold. Factors that enter into the estimate of the Company’s warranty reserve include: the number of units shipped, anticipated rates of warranty claims, and cost per claim. The Company periodically assesses the adequacy of its recorded warranty liability and adjusts the reserve as necessary. The current portions of the warranty reserve were $383,000 and $286,000 as of June 30, 2014, and March 31, 2014, respectively, and are presented on the Condensed Consolidated Balance Sheets as Accrued expenses. The non-current portions of the warranty reserve were $41,000 and $42,000 as of June 30, 2014, and March 31, 2014, respectively, and are presented on the Condensed Consolidated Balance Sheets in Other non-current liabilities.
	The following table presents the changes in the Company’s product warranty reserve:
		Three months ended June 30,
	(in thousands)	2014			2013
	Total product warranty reserve at the beginning of the	$	328		$	152
	period
	Warranty reserve from business acquisitions	—			54
	Warranty expense	122			19
	Utilization	(26		)	(11		)
	Total product warranty reserve at the end of the period	$	424		$	214

Variable_Interest_Entity_and_G

Variable Interest Entity and Guarantee	3 Months Ended
	Jun. 30, 2014
Guarantees [Abstract]	'
Equity Method Investment [Text Block]	'
	Variable Interest Entity and Guarantee
	The Company has a 50% equity ownership in AccessTel Kentrox Australia PTY LTD (AKA). AKA distributes network management solutions provided by the Company and the other 50% owner to one customer. The Company holds equal voting control with the other owner. All actions of AKA are decided at the board level by majority vote. The Company evaluated ASC topic 810, Consolidations, and concluded that AKA is a variable interest entity (VIE). The Company has concluded that it is not the primary beneficiary of AKA and therefore consolidation is not required. As of June 30, 2014 and March 31, 2014, the carrying amount of the Company's investment in AKA was approximately $88,000 and $84,000, respectively, which is presented on the Condensed Consolidated Balance Sheets within Other non-current assets.
	The Company's revenue from sales to AKA for the first quarter of fiscal year 2015 and 2014 was $0.2 million and $1.3 million, respectively. Accounts receivable from AKA is $0.2 million and $0.4 million as of June 30, 2014 and March 31, 2014, respectively. Deferred revenue relating to AKA maintenance contracts is $0.8 million as of June 30, 2014 and $1.0 million as of March 31, 2014. The Company also has an unlimited guarantee for the performance of the other 50% owner in AKA, who primarily provides support and engineering services to the customer. This guarantee was put in place at the request of the AKA customer. The guarantee which is estimated to have a maximum potential future payment of $0.7 million, will stay in place as long as the contract between AKA and the customer is in place. The Company would have recourse against the other 50% owner in AKA in the event the guarantee is triggered. The Company determined that it could perform on the obligation it guaranteed at a positive rate of return and therefore did not assign value to the guarantee. The Company's exposure to loss as a result of its involvement with AKA, exclusive of lost profits, is limited to the items noted above.

Income_Taxes

Income Taxes	3 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	At the end of each interim period, the Company makes its best estimate of the effective tax rate expected to be applicable for the full fiscal year and uses that rate to provide for income taxes on a current year-to-date basis before discrete items. If a reliable estimate cannot be made, the Company may make a reasonable estimate of the annual effective tax rate, including use of the actual effective rate for the year-to-date. The impact of discrete items is recorded in the quarter in which they occur. The Company utilizes the liability method of accounting for income taxes and deferred taxes which are determined based on the differences between the financial statements and tax basis of assets and liabilities given the enacted tax laws. The Company evaluates the need for valuation allowances on the net deferred tax assets under the rules of ASC 740 Income Taxes. In assessing the realizability of the Company's deferred tax assets, the Company considered whether it is more likely than not that some or all of the deferred tax assets will be realized though the generation of future taxable income. In making this determination, the Company assessed all of the evidence available at the time including recent earnings, forecasted income projections and historical performance. In fiscal year 2013, the Company determined that the negative evidence outweighed the objectively verifiable positive evidence and recorded a full valuation allowance against deferred tax assets. The Company will continue to reassess realizability going forward.
	The Company recorded $29,000 of income tax benefit in the three months ended June 30, 2014, using an effective income tax rate of 0.5% plus discrete items. The Company recorded $19,000 of income tax expense in the three months ended June 30, 2013 using an effective rate of (0.7)%. The effective rate is impacted by states which base tax on gross margin and not pre-tax income.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Obligations
	Future obligations and commitments, which are comprised of future minimum lease payments, inventory purchase obligations, and contingent consideration increased $3.6 million in the three months ended June 30, 2014, to $27.3 million, from $23.7 million at March 31, 2014. The IBW segment accounted for $5.8 million of the increase which resulted primarily from purchase obligations from increased demand for UDIT product. This increase was offset in part by a reduction of CSG product purchase obligations and a $0.6 million payment of contingent consideration.
	Purchase obligations consist of inventory that arises in the normal course of business operations. Future obligations and commitments as of June 30, 2014, consisted of the following:
		Payments due within
	(in thousands)	Year 1		Year 2		Year 3		Year 4		Year 5		Thereafter		Total
	Purchase obligations	$	16,089	$	—	$	—	$	—	$	—	$	—	$	16,089
	Future minimum operating lease	3,180		2,678		2,657		438		134		29		9,116
	payments
	Contingent consideration	1,609		468		—		—		—		—		2,077
	Future obligations and	$	20,878	$	3,146	$	2,657	$	438	$	134	$	29	$	27,282
	commitments
	Litigation and Contingency Reserves
	The Company and its subsidiaries are involved in various assertions, claims, proceedings and requests for indemnification concerning intellectual property, including patent infringement suits involving technologies that may be incorporated in the Company’s products, which are being handled and defended in the ordinary course of business.  These matters are in various stages of investigation and litigation, and they are being vigorously defended.  Although the Company does not expect that the outcome in any of these matters, individually or collectively, will have a material adverse effect on its financial condition or results of operations, litigation is inherently unpredictable.  Therefore, judgments could be rendered, or settlements entered, that could adversely affect the Company’s operating results or cash flows in a particular period. The Company routinely assesses all of its litigation and threatened litigation as to the probability of ultimately incurring a liability, and it records its best estimate of the ultimate loss in situations where it assesses the likelihood of loss as probable. As of June 30, 2014 and March 31, 2014, the Company has not recorded any contingent liability attributable to existing litigation.
	As of June 30, 2014, and March 31, 2014, the Company had total contingency reserves of $0.7 million and $0.7 million, respectively, related to the discontinued operations of ConferencePlus. The contingency reserves are classified as accrued expenses on the Consolidated Balance Sheets. In fiscal year 2014, the Company paid $1.1 million relating to a ConferencePlus indemnification claim.
	Additionally, the Company has a contingent cash consideration payable related to an acquisition.  The contingent consideration becomes payable based upon the profitability of the acquired products for post-closing periods through June 30, 2016, and may be offset by working capital adjustments and other indemnification claims. The maximum earn-out that could be paid before offsets is $3.5 million. As of June 30, 2014, and March 31, 2014, the fair value of the contingent consideration liability after offsetting a working capital adjustment and an indemnification claim for warranty obligations was $2.1 million and $2.6 million, respectively (see Note 13).

Shortterm_Investments

Short-term Investments	3 Months Ended
	Jun. 30, 2014
Short-term Investments [Abstract]	'
Short-term Investments	'
	Short-term Investments
	The following table presents short-term investments as of June 30, 2014, and March 31, 2014:
	(in thousands)	June 30, 2014		March 31, 2014
	Certificates of deposit	$	3,043	$	1,476
	Held-to-maturity, pre-refunded municipal bonds	10,085		14,108
	Total short-term investments	$	13,128	$	15,584
	The fair value of investments approximates their carrying amounts due to the short-term nature of these financial assets.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	Fair value is defined by ASC 820 as the price that would be received upon selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:
	•	Level 1 – Quoted prices in active markets for identical assets and liabilities.
	•	Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.
	•	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.
	The Company’s money market funds are measured using Level 1 inputs. The contingent consideration described in Note 11 is measured using Level 3 inputs.
	The following table presents financial assets and non-financial liabilities measured at fair value on a recurring basis and their related valuation inputs as of June 30, 2014:
	(in thousands)	Total Fair Value			Quoted Prices in			Significant Other	Significant		Balance Sheet
		of Asset or			Active Markets			Observable Inputs	Unobservable		Classification
		Liability			for Identical Assets			(Level 2)	Inputs
					(Level 1)				(Level 3)
	Assets:
	Money market funds	$	3,082		$	3,082		—	—		Cash and cash
											equivalents
	Liabilities:
	Contingent consideration, current	$	1,609		—			—	$	1,609	Contingent
											consideration
	Contingent consideration, non-	$	468		—			—	$	468	Contingent consideration non-current
	current
	The following table presents financial assets and liabilities measured at fair value on a recurring basis and their related valuation inputs as of March 31, 2014:
	(in thousands)	Total Fair Value			Quoted Prices in			Significant Other	Significant		Balance Sheet
		of Asset or			Active Markets			Observable Inputs	Unobservable		Classification
		Liability			for Identical Assets			(Level 2)	Inputs
					(Level 1)				(Level 3)
	Assets:
	Money market funds	$	117		$	117		—	—		Cash and cash
											equivalents
	Liabilities:
	Contingent consideration, current	$	2,067		—			—	$	2,067	Contingent consideration
	Contingent consideration, non-	$	574		—			—	$	574	Contingent
	current										consideration
											non-current
	The fair value of the money market funds approximates their carrying amounts due to the short-term nature of these financial assets.
	In connection with an acquisition in the quarter ended June 30, 2012, payment of a portion of the purchase price is contingent upon the profitability of the acquired products for post-closing periods through June 30, 2016, and may be offset by working capital adjustments and other indemnification claims. The Company estimates the fair value of contingent consideration as the present value of the expected payments over the term of the arrangement based on financial forecasts of future profitability of the acquired products, and reaching the forecast. This estimate is subject to ongoing evaluation. The actual cash payment could range from $0.6 million to $2.7 million.
	The fair value measurement of contingent consideration as of June 30, 2014 and March 31, 2014, encompasses the following significant unobservable inputs:
	($ in thousands)	Unobservable Inputs for Three Months Ended
		30-Jun-14			31-Mar-14
	Estimated earn-out contingent consideration	$	3,500		$	3,500
	Working capital and other adjustment	(444		)	(444		)
	Indemnification related to warranty claims	(303		)	(303		)
	Discount rate	7.4		%	7.5		%
	Approximate timing of cash flows	1.4 years			1.4 years
	The following table summarizes contingent consideration activity:
	(in thousands)
	Balance as of March 31, 2014	$	2,641
	Contingent consideration – payments	(575		)
	Contingent consideration – change in fair value in G&A expense	11
	Balance as of June 30, 2014	$	2,077

Share_Repurchases

Share Repurchases	3 Months Ended
	Jun. 30, 2014
Payments for Repurchase of Equity [Abstract]	'
Share Repurchases	'
	Share Repurchases
	In August 2011, the Board of Directors authorized a share repurchase program whereby the Company may repurchase up to an aggregate of $20.0 million of its outstanding Class A Common Stock (the "authorization”). There were no shares repurchased under this authorization during the three months ended June 30, 2014 or June 30, 2013. There was approximately $0.1 million remaining for additional share repurchases under this program as of June 30, 2014.
	Additionally, in the three months ended June 30, 2014, and 2013, the Company repurchased 168,094 and 147,274 shares of Class A Common Stock, respectively, from certain employees that were surrendered to satisfy the minimum statutory tax withholding obligations on the vesting of restricted stock, RSUs and PSUs. These repurchases are not included in the authorized share repurchase program and had a weighted-average purchase price of $3.48 and $2.02 per share, respectively.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Condensed consolidated financial statements	'
	The accompanying Condensed Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries. The Condensed Consolidated Financial Statements have been prepared using generally accepted accounting principles (GAAP) in the United States for interim financial reporting, and consistent with the instructions of Form 10-Q and Article 10 of Regulation S-X, and accordingly they do not include all of the information and footnotes required in the annual consolidated financial statements and accompanying footnotes. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended March 31, 2014. All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and that affect revenue and expenses during the periods reported. Estimates are used when accounting for the allowance for uncollectible accounts receivable, net realizable value of inventory, product warranty accrued, relative selling prices, stock-based compensation, goodwill and intangible assets fair value, depreciation, income taxes, and contingencies, among other things. Actual results could differ from those estimates.
New Accounting Pronouncements	'
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue From Contracts With Customers, that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The ASU is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. The ASU becomes effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period; early adoption is not permitted. The Company is currently assessing the impact that this standard will have on its Consolidated Financial Statements.
Shipping and Handling Cost	'
	Effective April 1, 2014, the Company made a voluntary change in accounting principle to classify shipping and handling costs associated with the distribution of finished product to our customers as cost of revenue (previously recorded in sales and marketing expense). The Company made the voluntary change in principle because it believes the classification of shipping and handling costs in cost of revenue better reflects the cost of producing and distributing products. It also enhances the comparability of the financial statements with many industry peers. As required by U.S. generally accepted accounting principles, the change has been reflected in the Condensed Consolidated Statements of Operations through retrospective application of the change in accounting principle.
Inventory	'
	Inventories are stated at the lower of first-in, first-out cost or market value.
Fair Value Measurement	'
	Fair value is defined by ASC 820 as the price that would be received upon selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:
	•	Level 1 – Quoted prices in active markets for identical assets and liabilities.
	•	Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.
	•	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

Basis_of_Presentation_Basis_of

Basis of Presentation Basis of Presentation (Tables)	3 Months Ended
	Jun. 30, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	'
	The following table provides the reconciliation from previously reported financial data as adjusted:
		Three months ended June 30, 2013
	(in thousands)	Previously reported			Effect of Accounting Principle Change			Adjusted
	Revenue	$	22,456		$	—		$	22,456
	Cost of revenue	13,680			359			14,039
	Gross profit	$	8,776		$	(359	)	$	8,417
	Gross margin	39.1		%				37.5		%
	Sales and marketing	$	3,418		$	(359	)	$	3,059

Acquisitions_Tables

Acquisitions (Tables)	3 Months Ended
	Jun. 30, 2014
Business Acquisition [Line Items]	'
Schedule of Purchase Price Allocation [Table Text Block]	'
	The following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed as of the March 1, 2014, acquisition date:
	(in thousands)	Preliminary Amounts Recognized as of Acquisition				Measurement Period Adjustments				Adjusted Preliminary Amounts Recognized
		Date (1)
	Cash	$	6,513			$	—			$	6,513
	Accounts receivable	2,920				(20		)	(c)	2,900
	Inventories	7,625				(242		)	(c)	7,383
	Prepaid expenses and other current assets	158				(23		)	(c)	135
	Property and equipment	816				(45		)	(c)	771
	Intangible assets	16,230				(507		)	(a)	15,723
	Accounts payable, accruals and other liabilities	(2,875		)		(37		)	(c)	(2,912		)
	Income tax payable	(1,175		)		—				(1,175		)
	Deferred income tax liability	(6,616		)		193			(a)	(6,423		)
	Goodwill	20,142				985				21,127
	Total Consideration	$	43,738			$	304		(b)	$	44,042
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	'
	The following table summarizes the acquired identified intangible assets and the respective fair value and estimated useful life at the date of acquisition:
	(in thousands)		Fair Value				Estimated Life
	Backlog		$	70			1 month
	Customer relationships		10,980				9 years
	Trademark		303				1 year
	Developed technology		3,860				3 years
	Non-compete		510				2 years
	Total intangible assets		$	15,723
Business Acquisition, Pro Forma Information [Table Text Block]	'
	The following unaudited summary information is presented on a consolidated pro forma basis as if the CSI acquisition had occurred on April 1, 2012. The pro forma amounts reflect the accounting effects of the business combination, including the application of the Company's accounting policies, amortization of intangible assets based on the estimated fair value and the impact of other fair value purchase accounting impacts such as inventory valuation step-up. The pro forma results are based on historical information and is not necessarily indicative of the combined results had the acquisition been completed at April 1, 2012, nor are they indicative of future combined results.
	(in thousands)		Three months ended June 30, 2013
	Consolidated pro forma revenue		$	31,374
	Consolidated pro forma operating loss		$	(815	)

Restructuring_Charge_Tables

Restructuring Charge (Tables)	3 Months Ended
	Jun. 30, 2014
Restructuring Charges [Abstract]	'
Restructuring charges	'
	Total restructuring charges and their utilization for the three months ended June 30, 2014 and 2013 are summarized as follows:
		Three months ended June 30, 2014			Three months ended June 30, 2013
	(in thousands)	Employee-related			Employee-related
	Liability at beginning of period	$	57		$	6
	Charged	57			66
	Paid	(74		)	(6		)
	Liability at end of period	$	40		$	66

Interim_Segment_Information_Ta

Interim Segment Information (Tables)	3 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segment information	'
	Segment information for the three months ended June 30, 2014, and 2013 is set forth below:
		Three months ended June 30, 2014
	(in thousands)	CSG			IBW			Total
	Revenue	$	13,728		$	14,097		$	27,825
	Cost of revenue	9,855			8,286			18,141
	Gross profit	3,873			5,811			9,684
	Gross margin	28.2		%	41.2		%	34.8		%
	Research and development	2,280			2,195			4,475
	Segment profit	$	1,593		$	3,616		5,209
	Operating expenses:
	Sales and marketing							3,421
	General and administrative							3,054
	Intangible amortization							1,585
	Restructuring							57
	Operating loss							(2,908		)
	Other income (expense)							61
	Income tax benefit (expense)							29
	Net loss from continuing operations							$	(2,818	)
		Three months ended June 30, 2013
	(in thousands)	CSG			IBW			Total
	Revenue	$	21,429		$	1,027		$	22,456
	Cost of revenue	13,307			732			14,039
	Gross profit	8,122			295			8,417
	Gross margin	37.9		%	28.7		%	37.5		%
	Research and development	2,507			192			2,699
	Segment profit	$	5,615		$	103		5,718
	Operating expenses:
	Sales and marketing							3,059
	General and administrative							3,572
	Intangible amortization							1,622
	Restructuring							66
	Operating loss							(2,601		)
	Other income (expense)							(130		)
	Income tax benefit (expense)							(19		)
	Net loss from continuing operations							$	(2,750	)

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Jun. 30, 2014
Inventory, Net [Abstract]	'
Components of inventories	'
	Inventories are stated at the lower of first-in, first-out cost or market value. The components of inventories are as follows:
	(in thousands)	June 30, 2014		31-Mar-14
	Raw materials	$	11,339	$	11,031
	Finished goods and sub-assemblies	11,724		13,025
	Total inventories	$	23,063	$	24,056

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Jun. 30, 2014
Share-based Compensation [Abstract]	'
Stock-based compensation expense	'
	The following table is a summary of total stock-based compensation resulting from stock options, restricted stock, restricted stock units (RSUs) and performance stock units (PSUs), during the three months ended June 30, 2014, and 2013:
		Three months ended June 30,
	(in thousands)	2014			2013
	Stock-based compensation expense	$	554		$	351
	Income tax expense	—			—
	Total stock-based compensation expense after taxes	$	554		$	351
Stock option activity	'
	Stock option activity for the three months ended June 30, 2014 is as follows:
		Shares		Weighted-Average			Weighted-Average	Aggregate
				Exercise Price Per			Remaining	Intrinsic Value (a) (in
				Share			Contractual Term	thousands)
							(in years)
	Outstanding on March 31, 2014	1,835,445		$	2.02		3.7	$	3,110
	Granted	40,000		3.47
	Exercised	(54,300	)	2.39
	Forfeited	(52,500	)	2.43
	Expired	(23,000	)	3.04
	Outstanding on June 30, 2014	1,745,645		$	2.01		3.6	$	952
	(a)	The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the average of the high and low Westell Technologies’ stock price as of the reporting date.
Restricted stock activity	'
	Restricted Stock
	The following table sets forth restricted stock activity for the three months ended June 30, 2014:
		Shares		Weighted-Average
				Grant Date Fair
				Value
	Non-vested as of March 31, 2014	407,500		$	1.94
	Granted	80,000		3.83
	Vested	(277,500	)	1.65
	Forfeited	—		—
	Non-vested as of June 30, 2014	210,000		$	3.05
	RSUs
	The following table sets forth the RSU activity for the three months ended June 30, 2014:
		Shares		Weighted-Average
				Grant Date Fair
				Value
	Non-vested as of March 31, 2014	1,679,000		$	3.09
	Granted	217,500		3.83
	Vested	(227,500	)	2.68
	Forfeited	(121,000	)	2.75
	Non-vested as of June 30, 2014	1,548,000		$	3.28
	PSUs
	The PSUs vest in annual increments based on the achievement of pre-established Company performance goals and continued employment. The number of PSUs earned, if any, can range between 0% to 200% of the target amount, depending on actual performance for four fiscal years following the grant date. Upon vesting, the PSUs convert into shares of Class A Common Stock on a one-for-one basis.
	The following table sets forth the PSU activity for the three months ended June 30, 2014:
		Shares		Weighted-Average Grant Date Fair Value
	Non-vested as of March 31, 2014	285,000		$	2.45
	Granted, at target	217,500		3.83
	Vested	(66,764	)	2.45
	Forfeited	(41,801	)	2.93
	Non-vested as of June 30, 2014	393,935		$	3.16

Product_Warranties_Tables

Product Warranties (Tables)	3 Months Ended
	Jun. 30, 2014
Product Warranties Disclosures [Abstract]	'
Changes in Company's product warranty reserve	'
	The following table presents the changes in the Company’s product warranty reserve:
		Three months ended June 30,
	(in thousands)	2014			2013
	Total product warranty reserve at the beginning of the	$	328		$	152
	period
	Warranty reserve from business acquisitions	—			54
	Warranty expense	122			19
	Utilization	(26		)	(11		)
	Total product warranty reserve at the end of the period	$	424		$	214

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]	'
	Future obligations and commitments as of June 30, 2014, consisted of the following:
		Payments due within
	(in thousands)	Year 1		Year 2		Year 3		Year 4		Year 5		Thereafter		Total
	Purchase obligations	$	16,089	$	—	$	—	$	—	$	—	$	—	$	16,089
	Future minimum operating lease	3,180		2,678		2,657		438		134		29		9,116
	payments
	Contingent consideration	1,609		468		—		—		—		—		2,077
	Future obligations and	$	20,878	$	3,146	$	2,657	$	438	$	134	$	29	$	27,282
	commitments

Shortterm_Investments_Tables

Short-term Investments (Tables)	3 Months Ended
	Jun. 30, 2014
Short-term Investments [Abstract]	'
Short-term investments	'
	The following table presents short-term investments as of June 30, 2014, and March 31, 2014:
	(in thousands)	June 30, 2014		March 31, 2014
	Certificates of deposit	$	3,043	$	1,476
	Held-to-maturity, pre-refunded municipal bonds	10,085		14,108
	Total short-term investments	$	13,128	$	15,584

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'
	The following table presents financial assets and non-financial liabilities measured at fair value on a recurring basis and their related valuation inputs as of June 30, 2014:
	(in thousands)	Total Fair Value			Quoted Prices in			Significant Other	Significant		Balance Sheet
		of Asset or			Active Markets			Observable Inputs	Unobservable		Classification
		Liability			for Identical Assets			(Level 2)	Inputs
					(Level 1)				(Level 3)
	Assets:
	Money market funds	$	3,082		$	3,082		—	—		Cash and cash
											equivalents
	Liabilities:
	Contingent consideration, current	$	1,609		—			—	$	1,609	Contingent
											consideration
	Contingent consideration, non-	$	468		—			—	$	468	Contingent consideration non-current
	current
	The following table presents financial assets and liabilities measured at fair value on a recurring basis and their related valuation inputs as of March 31, 2014:
	(in thousands)	Total Fair Value			Quoted Prices in			Significant Other	Significant		Balance Sheet
		of Asset or			Active Markets			Observable Inputs	Unobservable		Classification
		Liability			for Identical Assets			(Level 2)	Inputs
					(Level 1)				(Level 3)
	Assets:
	Money market funds	$	117		$	117		—	—		Cash and cash
											equivalents
	Liabilities:
	Contingent consideration, current	$	2,067		—			—	$	2,067	Contingent consideration
	Contingent consideration, non-	$	574		—			—	$	574	Contingent
	current										consideration
											non-current
Fair value measurement of contingent consideration	'
	The fair value measurement of contingent consideration as of June 30, 2014 and March 31, 2014, encompasses the following significant unobservable inputs:
	($ in thousands)	Unobservable Inputs for Three Months Ended
		30-Jun-14			31-Mar-14
	Estimated earn-out contingent consideration	$	3,500		$	3,500
	Working capital and other adjustment	(444		)	(444		)
	Indemnification related to warranty claims	(303		)	(303		)
	Discount rate	7.4		%	7.5		%
	Approximate timing of cash flows	1.4 years			1.4 years
Summarizes contingent consideration activity	'
	The following table summarizes contingent consideration activity:
	(in thousands)
	Balance as of March 31, 2014	$	2,641
	Contingent consideration – payments	(575		)
	Contingent consideration – change in fair value in G&A expense	11
	Balance as of June 30, 2014	$	2,077

Basis_of_Presentation_Basis_of1

Basis of Presentation Basis of Presentation Table (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'
Revenue	$27,825	$22,456
Cost of revenue	18,141	14,039	[1]
Gross profit	9,684	8,417	[1]
Gross margin	34.80%	37.50%
Sales and marketing	3,421	3,059	[1]
Scenario, Previously Reported [Member]	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'
Revenue	'	22,456
Cost of revenue	'	13,680
Gross profit	'	8,776
Gross margin	'	39.10%
Sales and marketing	'	3,418
Restatement Adjustment [Member]	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'
Revenue	'	0
Cost of revenue	'	359
Gross profit	'	-359
Sales and marketing	'	($359)
[1]	Certain amounts have been reclassified to reflect a change in accounting principle.

Basis_of_Presentation_Details_

Basis of Presentation (Details Textual) (USD $)	3 Months Ended					3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Apr. 02, 2013	Mar. 02, 2014	Jun. 30, 2013
				Kentrox [Member]	CSI [Member]	Restatement Adjustment [Member]
Business Acquisition [Line Items]	'	'		'	'	'
Equity Method Investment, Ownership Percentage	'	'		100.00%	100.00%	'
Cost of revenue	$18,141,000	$14,039,000	[1]	'	'	$359,000
CostofRevenueAdjustmentUsingPreviousAccountingGuidance	255,000	'		'	'	'
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	'	$0		'	'	'
[1]	Certain amounts have been reclassified to reflect a change in accounting principle.

Basis_of_Presentation_Basis_of2

Basis of Presentation Basis of Presentation ( Parenthetical) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013		Mar. 31, 2014
Business Acquisition [Line Items]	'	'		'
Sales and marketing	$3,421	$3,059	[1]	'
SalesandMarketingAdjustmentUsingPreviousAccountingGuidance	255	'		'
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income from Continuing Operations	'	0		'
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	'	'		0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share	'	$0		'
Restatement Adjustment [Member]	'	'		'
Business Acquisition [Line Items]	'	'		'
Sales and marketing	'	($359)		'
[1]	Certain amounts have been reclassified to reflect a change in accounting principle.

Acquistions_Details

Acquistions (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014		Mar. 02, 2014
In Thousands, unless otherwise specified
Business Acquisition [Line Items]	'	'		'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	'		$15,723
Goodwill	31,682	31,682	[1]	'
CSI [Member] | IBW [Member]	'	'		'
Business Acquisition [Line Items]	'	'		'
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAcquired	'	'		6,513
Business Acquisition, Purchase Price Allocation, Current Assets Trade Accounts Receivable	'	'		2,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	'	'		7,383
BusinessAcquisitionPurchasePriceAllocationCurrentAssetsOtherassets	'	'		135
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	'	'		771
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	'		15,723
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	'	'		-2,912
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	'	'		-1,175
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	'	'		-6,423
Goodwill	21,100	'		21,127
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	'	'		44,042
CSI [Member] | Scenario, Previously Reported [Member]	'	'		'
Business Acquisition [Line Items]	'	'		'
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAcquired	'	'		6,513
Business Acquisition, Purchase Price Allocation, Current Assets Trade Accounts Receivable	'	'		2,920
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	'	'		7,625
BusinessAcquisitionPurchasePriceAllocationCurrentAssetsOtherassets	'	'		158
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	'	'		816
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	'		16,230
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	'	'		-2,875
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	'	'		-1,175
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	'	'		-6,616
Goodwill	'	'		20,142
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	'	'		43,738
CSI [Member] | Restatement Adjustment [Member]	'	'		'
Business Acquisition [Line Items]	'	'		'
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAcquired	'	'		0
Business Acquisition, Purchase Price Allocation, Current Assets Trade Accounts Receivable	'	'		-20	[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	'	'		-242	[2]
BusinessAcquisitionPurchasePriceAllocationCurrentAssetsOtherassets	'	'		-23	[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	'	'		-45	[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	'		-507	[3]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	'	'		-37	[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	'	'		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	'	'		193	[3]
Goodwill	'	'		985
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	'	'		$304	[4]
[1]	Certain amounts have been adjusted to reflect measurement period adjustments related to the CSI acquisition.
[2]	Other measurement period adjustments mostly related to inventory adjustments
[3]	Intangible asset fair value adjustment for trade name and related tax effect
[4]	Payment for final working capital adjustment

Acquisitions_Details_2

Acquisitions (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 02, 2014
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	$15,723
Order or Production Backlog [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	70
Finite-Lived Intangible Asset, Useful Life	'0 years 1 month	'
Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	10,980
Finite-Lived Intangible Asset, Useful Life	'9 years	'
Trademarks [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	303
Finite-Lived Intangible Asset, Useful Life	'1 year	'
Technology [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	3,860
Finite-Lived Intangible Asset, Useful Life	'3 years	'
Noncompete [Member]	'	'
Business Acquisition [Line Items]	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	$510
Finite-Lived Intangible Asset, Useful Life	'2 years	'

Acquisitions_Details_3

Acquisitions (Details 3) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013
Business Acquisition [Line Items]	'
Consolidated pro forma revenue	$31,374
Consolidated pro forma operating loss	($815)

Acquisitions_Details_Textual

Acquisitions (Details Textual) (USD $)	3 Months Ended			12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2014	Mar. 02, 2014
Business Acquisition [Line Items]	'	'	'	'	'
Business Acquisition, Percentage of Voting Interests Acquired	'	'	'	'	100.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	$39,000,000	'	'	'
Working Capital Adjustment	'	'	'	'	5,000,000
Business Combination, Acquisition Related Costs	39,000	'	'	200,000	'
Revenue	27,825,000	'	22,456,000	'	'
Operating loss	-2,908,000	'	-2,601,000	'	'
CSI [Member]	'	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'	'
Revenue	9,200,000	'	'	'	'
Operating loss	$200,000	'	'	'	'

Goodwill_and_Intangibles_Detai

Goodwill and Intangibles (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014		Jun. 30, 2014	Mar. 02, 2014	Jun. 30, 2014
In Thousands, unless otherwise specified				CSI [Member]	CSI [Member]	Kentrox [Member]
				IBW [Member]	IBW [Member]	CSG [Member]
Goodwill [Line Items]	'	'		'	'	'
Goodwill	$31,682	$31,682	[1]	$21,100	$21,127	$10,600
Intangible assets, net	$30,307	$31,892	[1]	'	'	'
[1]	Certain amounts have been adjusted to reflect measurement period adjustments related to the CSI acquisition.

Restructuring_Charge_Details

Restructuring Charge (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Restructuring charges	'	'
Liability at beginning of period	$57	'
Charged	57	66
Liability at end of period	40	'
Employee Severance [Member]	'	'
Restructuring charges	'	'
Liability at beginning of period	57	6
Charged	57	66
Paid	-74	-6
Liability at end of period	$40	$66

Restructuring_Charge_Details_T

Restructuring Charge (Details Textual) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014
Restructuring Charge (Textual) [Abstract]	'	'	'
Restructuring	$57	$66	'
Restructuring and Related Cost, Expected Cost	392	'	'
Unpaid balance of restructuring charges	$40	'	$57

Interim_Segment_Information_De

Interim Segment Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
	segments
Segment Reporting Information [Line Items]	'	'
Number of Reportable Segments	2	'
Segment information	'	'
Revenue	$27,825	$22,456
Cost of revenue	18,141	14,039	[1]
Gross profit	9,684	8,417	[1]
Gross margin	34.80%	37.50%
Research and development	4,475	2,699
Segment profit	5,209	5,718
Operating expenses:	'	'
Sales and marketing	3,421	3,059	[1]
General and administrative	3,054	3,572
Intangible amortization	1,585	1,622
Restructuring	57	66
Operating loss	-2,908	-2,601
Other income (expense), net	61	-130
Income tax benefit (expense)	29	-19
Net loss from continuing operations	-2,818	-2,750
CSG [Member]	'	'
Segment information	'	'
Revenue	13,728	21,429
Cost of revenue	9,855	13,307
Gross profit	3,873	8,122
Gross margin	28.20%	37.90%
Research and development	2,280	2,507
Segment profit	1,593	5,615
IBW [Member]	'	'
Segment information	'	'
Revenue	14,097	1,027
Cost of revenue	8,286	732
Gross profit	5,811	295
Gross margin	41.20%	28.70%
Research and development	2,195	192
Segment profit	$3,616	$103
[1]	Certain amounts have been reclassified to reflect a change in accounting principle.

Inventories_Details

Inventories (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Components of inventories	'	'
Raw materials	$11,339	$11,031
Finished goods and sub-assemblies	11,724	13,025
Total inventories	$23,063	$24,056	[1]
[1]	Certain amounts have been adjusted to reflect measurement period adjustments related to the CSI acquisition.

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Stock-based compensation expense	'	'
Stock-based compensation expense	$554	$351
Income tax expense	0	0
Total stock-based compensation expense after taxes	$554	$351

StockBased_Compensation_Detail1

Stock-Based Compensation (Details 1) (Employee Stock Option [Member], USD $)	3 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014		Mar. 31, 2014
Employee Stock Option [Member]	'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'		'
Outstanding on March 31, 2014	1,835,445		'
Granted	40,000		'
Exercised	-54,300		'
Forfeited	-52,500		'
Expired	-23,000		'
Outstanding on June 30, 2014	1,745,645		1,835,445
Weighted-Average Exercise Price Per Share, Outstanding on March 31, 2014	$2.02		'
Weighted-Average Exercise Price Per Share, Granted	$3.47		'
Weighted-Average Exercise Price Per Share, Exercised	$2.39		'
Weighted-Average Exercise Price Per Share, Forfeited	$2.43		'
Weighted-Average Exercise Price Per Share, Expired	$3.04		'
Weighted-Average Exercise Price Per Share, Outstanding on June 30, 2014	$2.01		$2.02
Weighted-Average Remaining Contractual Term (in years), Outstanding on March 31, 2014	'3 years 6 months 22 days		'3 years 8 months 19 days
Weighted-Average Remaining Contractual Term (in years), Outstanding on June 30, 2014	'3 years 6 months 22 days		'3 years 8 months 19 days
Aggregate Intrinsic Value, Outstanding on March 31, 2014	$3,110	[1]	'
Aggregate Intrinsic Value, Outstanding on June 30, 2014	$952	[1]	$3,110	[1]
[1]	The intrinsic value for the stock options is calculated based on the difference between the exercise price of the underlying awards and the average of the high and low Westell Technologiesb stock price as of the reporting date.

StockBased_Compensation_Detail2

Stock-Based Compensation (Details 2) (USD $)	3 Months Ended
	Jun. 30, 2014
Restricted Stock [Member]	'
Restricted stock activity	'
Non-vested as of March 31, 2014	407,500
Granted	80,000
Vested	-277,500
Forfeited	0
Non-vested as of June 30, 2014	210,000
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2014	$1.94
Weighted-Average Grant Date Fair Value, Granted	$3.83
Weighted-Average Grant Date Fair Value, Vested	$1.65
Weighted-Average Grant Date Fair Value, Forfeited	$0
Weighted-Average Grant Date Fair Value, Non-vested as of June 30, 2014	$3.05
Restricted Stock Units (RSUs) [Member]	'
Restricted stock activity	'
Non-vested as of March 31, 2014	1,679,000
Granted	217,500
Vested	-227,500
Forfeited	-121,000
Non-vested as of June 30, 2014	1,548,000
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2014	$3.09
Weighted-Average Grant Date Fair Value, Granted	$3.83
Weighted-Average Grant Date Fair Value, Vested	$2.68
Weighted-Average Grant Date Fair Value, Forfeited	$2.75
Weighted-Average Grant Date Fair Value, Non-vested as of June 30, 2014	$3.28
Performance Shares [Member]	'
Restricted stock activity	'
Non-vested as of March 31, 2014	285,000
Granted	217,500
Vested	-66,764
Forfeited	-41,801
Non-vested as of June 30, 2014	393,935
Weighted-Average Grant Date Fair Value, Non-vested as of March 31, 2014	$2.45
Weighted-Average Grant Date Fair Value, Granted	$3.83
Weighted-Average Grant Date Fair Value, Vested	$2.45
Weighted-Average Grant Date Fair Value, Forfeited	$2.93
Weighted-Average Grant Date Fair Value, Non-vested as of June 30, 2014	$3.16

StockBased_Compensation_Detail3

Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended
	Jun. 30, 2014
Stock-Based Compensation (Textual) [Abstract]	'
Vesting schedule of equal annual installments over four years	'4 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$1.27
Minimum [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Potential PSU attainment range	0.00%
Maximum [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Potential PSU attainment range	200.00%

Product_Warranties_Details

Product Warranties (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Changes in Company's product warranty reserve	'	'
Total product warranty reserve at the beginning of the period	$328	$152
Warranty reserve from business acquisitions	'	54
Warranty expense	122	19
Utilization	-26	-11
Total product warranty reserve at the end of the period	$424	$214

Product_Warranties_Details_Tex

Product Warranties (Details Textual) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014
In Thousands, unless otherwise specified			CSG [Member]	CSG [Member]	IBW [Member]	IBW [Member]
			Minimum [Member]	Maximum [Member]	Minimum [Member]	Maximum [Member]
Product Warranties (Textual) [Abstract]	'	'	'	'	'	'
Standard Product Warranty Description	'	'	'P1Y	'P7Y	'P1Y	'P5Y
Current portions of warranty reserve	$383	$286	'	'	'	'
Non-current portions of the warranty reserve	$41	$42	'	'	'	'

Variable_Interest_Entity_and_G1

Variable Interest Entity and Guarantee (Details) (USD $)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Apr. 02, 2013
			AKA [Member]	AKA [Member]	AKA [Member]	AKA [Member]
Concentration Risk [Line Items]	'	'	'	'	'	'
Equity Method Investment, Ownership Percentage	'	'	'	'	'	50.00%
Equity Method Investments	'	'	$88,000	'	$84,000	'
Revenue	27,825,000	22,456,000	200,000	1,300,000	'	'
Accounts Receivable, Net, Current	'	'	200,000	'	400,000	'
Deferred Revenue	'	'	800,000	'	1,000,000	'
Guarantor Obligations, Maximum Exposure, Undiscounted	'	'	$700,000	'	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Income Taxes (Textual) [Abstract]	'	'
Income tax benefit (expense)	$29	($19)
Effective tax rate	0.50%	-0.70%

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'	'
Purchase Obligation, Due in Next Twelve Months	$16,089	'
Purchase Obligation	16,089	'
Future minimum operating lease payments Due, Next Twelve Months	3,180	'
Future minimum operating lease payments, Due in Two Years	2,678	'
Future minimum operating lease payments, Due in Four Years	438	'
Future minimum operating lease payments, Due in Three Years	2,657	'
Future minimum operating lease payments, Due in Five Years	134	'
Operating Leases, Future Minimum Payments, Due Thereafter	29	'
Future minimum operating lease payments Due	9,116	'
Contingent consideration, Due in Next Twelve Months	1,609	'
Contingent consideration, Due in Second Year	468	'
Contingent consideration, Due in Third Year	'	'
Contingent consideration, Due in Fourth Year	'	'
Contingent consideration, Due in Fifth Year	'	'
Congingent consideration, Due after Fifth Year	'	'
Contingent Consideration	2,077	'
Future obligations and commitments, Due in Next Twelve Months	20,878	'
Future obligations and commitments, Due in Second Year	3,146	'
Future obligations and commitments, Due in Third Year	2,657	'
Future obligations and commitments, Due in Fourth Year	438	'
Future obligations and commitments, Due in Fifth Year	134	'
Purchase Obligation, Due after Fifth Year	29	'
Future obligations and commitments	$27,282	$23,700

Commitments_and_Contingencies_2

Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014
Loss Contingencies [Line Items]	'	'	'
Increase (decrease) in future obligations and commitments	$3,600,000	'	'
Future obligations and commitments	27,282,000	'	23,700,000
Payments for Previous Acquisition	575,000	'	'
Total contingent reserves related to intellectual property and indemnification claims	700,000	'	700,000
Maximum ANTONE earn-out that could be paid before offsets	3,500,000	'	'
Fair value of contingent consideration liability after offset of working capital adjustment and indemnification claim	2,077,000	'	2,641,000
CSG [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Increase (decrease) in future obligations and commitments	5,800,000	'	'
Arkadin [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Escrow Deposit Released	$1,100,000	'	'

Shortterm_Investments_Details

Short-term Investments (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Schedule of Investments [Line Items]	'	'
Certificates of deposit	$3,043	$1,476
Held-to-maturity, pre-refunded municipal bonds	10,085	14,108
Total short-term investments	$13,128	$15,584

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Contingent consideration	$1,609	$2,067
BusinessCombinationContingentConsiderationLiabilityNonCurrent	468	574
Recurring [Member] | Cash and cash equivalents [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Money market funds	3,082	117
Recurring [Member] | Accrued Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Contingent consideration	1,609	2,067
Recurring [Member] | Contingent consideration non-current [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
BusinessCombinationContingentConsiderationLiabilityNonCurrent	468	574
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and cash equivalents [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Money market funds	3,082	117
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Accrued Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Contingent consideration	'	'
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Contingent consideration non-current [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
BusinessCombinationContingentConsiderationLiabilityNonCurrent	'	'
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash and cash equivalents [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Money market funds	'	'
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Contingent consideration	'	'
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Contingent consideration non-current [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
BusinessCombinationContingentConsiderationLiabilityNonCurrent	'	'
Recurring [Member] | Unobservable Inputs (Level 3) [Member] | Cash and cash equivalents [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Money market funds	'	'
Recurring [Member] | Unobservable Inputs (Level 3) [Member] | Accrued Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
Contingent consideration	1,609	2,067
Recurring [Member] | Unobservable Inputs (Level 3) [Member] | Contingent consideration non-current [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis and their related valuation inputs	'	'
BusinessCombinationContingentConsiderationLiabilityNonCurrent	$468	$574

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 1) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Fair value measurement of contingent consideration	'	'
Maximum ANTONE earn-out that could be paid before offsets	$3,500	'
Unobservable Inputs (Level 3) [Member]	'	'
Fair value measurement of contingent consideration	'	'
Maximum ANTONE earn-out that could be paid before offsets	3,500	3,500
Working capital and other adjustment	-444	-444
Indemnification related to warranty claims	($303)	($303)
Discount rate	7.40%	7.50%
Approximate timing of cash flows	'1 year 4 months 10 days	'1 year 4 months 10 days

Fair_Value_Measurements_Detail2

Fair Value Measurements (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Fair Value Disclosures [Abstract]	'	'
Payments for Previous Acquisition	$575	'
Summarizes contingent consideration activity	'	'
Balance as of March 31, 2014	2,641	'
Contingent consideration b payments	-575	'
Contingent consideration b change in fair value in G&A expense	11	'
Balance as of June 30, 2014	$2,077	'

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value Measurements Textual (Details) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'
BusinessCombinationContingentConsiderationArrangementsRangeNetOfOutcomesValueLow	$0.60
BusinessCombinationContingentConsiderationArrangementsNetRangeOfOutcomesValueHigh	$2.70

Share_Repurchases_Details

Share Repurchases (Details) (Class A Common Stock, USD $)	1 Months Ended	3 Months Ended
In Millions, except Share data, unless otherwise specified	Aug. 31, 2011	Jun. 30, 2014	Jun. 30, 2013
August 2011 authorization [Member]	'	'	'
Share Repurchases (Textual) [Abstract]	'	'	'
Stock Repurchase Program	$20	'	'
Treasury Stock, Shares, Acquired	'	0	0
Stock Repurchase Program Remaining Authorized Repurchases Amount	'	$0.10	'
Outside of Publically Announced Repurchase Program [Member]	'	'	'
Share Repurchases (Textual) [Abstract]	'	'	'
Treasury Stock, Shares, Acquired	'	168,094	147,274
Treasury stock acquired volume weighted-average price	'	$3.48	2.02

Share_Repurchases_Share_Repurc

Share Repurchases Share Repurchases ( parenthetical) (Details) (August Two Thousand Eleven Authorization [Member], Class A Common Stock)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
August Two Thousand Eleven Authorization [Member] | Class A Common Stock	'	'
Payments for Repurchase of Equity [Abstract]	'	'
Treasury Stock, Shares, Acquired	0	0