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INCOME TAXES: (Tables)
12 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of allocation of total income tax expense (benefit)
Total income tax expense (benefit) was allocated as follows (dollars in thousands): 
 201920182017
Continuing operations$(45,409)$(65,723)$(45,184)
Discontinued operations470,346 42,952 49,718 
Stockholders’ equity:    
Excess tax benefits from stock-based compensation— — (2,183)
 $424,937 $(22,771)$2,351 
Schedule of income tax expense (benefit) attributable to loss from continuing operations
Income tax expense (benefit) attributable to loss from continuing operations consists of (dollars in thousands): 
 201920182017
Current:   
U.S. Federal$(39,534)$(33,626)$(33,289)
Non-U.S.323 115 188 
State(16,092)(4,414)(976)
 (55,303)(37,925)(34,077)
Deferred:   
U.S. Federal1,245 (26,884)(8,934)
Non-U.S.149 21 (3)
State8,500 (935)(2,170)
 9,894 (27,798)(11,107)
Total$(45,409)$(65,723)$(45,184)
Schedule of loss before income tax attributable to U.S. and non-U.S. continuing operations
Loss before income tax attributable to U.S. and non-U.S. continuing operations consists of (dollars in thousands):
 201920182017
U.S.$(174,867)$(132,552)$(128,646)
Non-U.S.(4,489)(470)(2,114)
Total$(179,356)$(133,022)$(130,760)
Schedule of reconciliation of expected income tax benefit computed using U.S. federal statutory income tax rate to actual income tax expense (benefit) from continuing operations
Below is a reconciliation of expected income tax benefit computed by applying the U.S. federal statutory rate of 21.0% for fiscal 2019, the blended U.S. federal statutory rate of 31.5% for fiscal 2018, and the U.S. federal statutory rate of 35.0% for fiscal 2017, respectively, to loss before income taxes to actual income tax benefit from continuing operations (dollars in thousands): 
 201920182017
Computed expected income tax (benefit)$(37,665)$(41,967)$(45,766)
Increase (reduction) in income taxes resulting from:   
State income taxes, net of federal benefit(5,998)(3,329)(2,045)
Research and other tax credits(3,141)(1,229)(1,174)
Effect of federal rate change on deferred taxes— (24,565)— 
Nondeductible expenses426 431 418 
Stock-based compensation(5,350)4,452 2,150 
Non-U.S. subsidiaries taxed at other rates1,343 332 714 
Adjustment to valuation allowances5,204 — — 
Other, net(228)152 519 
 $(45,409)$(65,723)$(45,184)
Schedule of components of deferred tax assets and liabilities
 20192018
Deferred tax assets:  
Accrued expenses$3,332 $5,737 
Deferred revenue19 437 
Net operating loss carryforwards13,638 40,783 
Stock-based compensation10,770 10,884 
Nonqualified deferred compensation3,147 3,217 
Capital loss carryforward— 2,099 
Tax credit carryforwards— 13,427 
Other3,102 185 
Total deferred tax assets34,008 76,769 
Less valuation allowance(18,947)(38,321)
Net deferred tax assets15,061 38,448 
Deferred tax liabilities:  
Prepaid expenses$(1,222)$(4,111)
Capitalized software costs(636)(7,343)
Property and equipment(440)(6,304)
Intangible assets(5,631)(42,402)
Deferred commissions(2,586)— 
Accrued expenses(4,550)(7,828)
Total deferred tax liabilities(15,065)(67,988)
Net deferred tax liabilities$(4)$(29,540)
Schedule of changes in total gross unrecognized tax benefits The following table sets forth changes in the total gross unrecognized tax benefits for the fiscal years ended March 31, 2019, 2018 and 2017 (dollars in thousands):
201920182017
Balance at beginning of period$15,415 $12,870 $10,906 
Increases related to prior year tax positions325 1,134 307 
Decreases related to prior year tax positions(292)(208)(466)
Increases related to current year tax positions5,483 3,172 2,123 
Lapse of statute of limitations(1,331)(1,553)— 
Balance at end of period$19,600 $15,415 $12,870