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OPERATIONS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of immaterial corrections to prior period financial information
The consolidated balance sheet and consolidated statements of changes in stockholders’ investment and redeemable noncontrolling interest reflect immaterial adjustments to the historical balances in retained earnings and accrued wages, benefits and related taxes for the years ended March 31, 2016, 2017 and 2018. We made these adjustments in accordance with GAAP, to reflect additional liability related to a vacation accrual for employees in Norway. The adjustment stems from our initial purchase price accounting for the Bristow Norway acquisition in October 2008 and subsequent accounting for employee vacation liability. We evaluated the materiality of the error from both a quantitative and qualitative perspective and concluded that the error was immaterial to our prior period interim and annual consolidated financial statements. Since the revision was not material to any prior period interim or annual consolidated financial statements, no amendments to previously filed interim or annual periodic reports were required. Consequently, we revised the historical consolidated financial information presented herein. Given the historical nature of the adjustment, we recorded a correction within the consolidated statements of stockholders’ investment and redeemable noncontrolling interest to retained earnings for March 31, 2015, 2016, 2017 and 2018 of $4.9 million. Retained earnings as reported was $1,284,442,000 and $1,172,273,000 for March 31, 2015 and 2016, respectively, compared to as adjusted of $1,279,493,000 and $1,167,324,000 for March 31, 2015 and 2016, respectively, after the correction. In addition, below are amounts as reported and as adjusted for each year presented (in thousands):
 
March 31, 2018
 
March 31, 2017
 
As reported
 
Adjustments
 
As adjusted
 
As reported
 
Adjustments
 
As adjusted
 
 
 
 
 
 
 
 
 
 
 
 
Accrued wages, benefits and related taxes
62,385

 
4,949

 
67,334

 
59,077

 
4,949

 
64,026

Retained earnings
793,783

 
(4,949
)
 
788,834

 
991,906

 
(4,949
)
 
986,957

Total Bristow Group stockholders’ investment
1,175,840

 
(4,949
)
 
1,170,891

 
1,289,207

 
(4,949
)
 
1,284,258

Total stockholders’ investment
1,183,093

 
(4,949
)
 
1,178,144

 
1,294,232

 
(4,949
)
 
1,289,283
Schedule of valuation and qualifying accounts disclosure
The following table is a rollforward of the allowance related to dormant, obsolete and excess inventory (in thousands):
     
 
Fiscal Year Ended March 31,
 
2018
 
2017
 
2016
Balance – beginning of fiscal year
$
21,514

 
$
27,763

 
$
45,414

Impairment of inventories
—

 
7,572

 
5,439

Additional allowances
6,355

 
1,617

 
192

Inventory disposed and scrapped
(3,353
)
 
(14,635
)
 
(22,428
)
Foreign currency effects
1,514

 
(803
)
 
(854
)
Balance – end of fiscal year
$
26,030

 
$
21,514

 
$
27,763

The following table is a rollforward of the allowance for doubtful accounts from non-affiliates (in thousands):
     
 
Fiscal Year Ended March 31,
 
2018
 
2017
 
2016
Balance – beginning of fiscal year
$
4,498

 
$
5,562

 
$
859

Additional allowances
1,463

 
575

 
6,638

Write-offs and collections
(2,657
)
 
(1,639
)
 
(1,935
)
Balance – end of fiscal year
$
3,304

 
$
4,498

 
$
5,562
Schedule of goodwill
Goodwill of $19.9 million and $19.8 million as of March 31, 2018 and 2017, respectively, related to our reporting units were as follows (in thousands):
 
Europe Caspian
 
Asia Pacific
 
Total
March 31, 2016
$
10,026

 
$
19,964

 
$
29,990

Foreign currency translation
(1,320
)
 
(166
)
 
(1,486
)
Impairments
(8,706
)
 
—

 
(8,706
)
March 31, 2017
—

 
19,798

 
19,798

Foreign currency translation
—

 
109

 
109

March 31, 2018
$
—

 
$
19,907

 
$
19,907

 
Accumulated goodwill impairment of $50.9 million as of both March 31, 2018 and 2017 related to our reporting units as follows (in thousands):
 
Europe Caspian
 
Africa
 
Americas
 
Corporate and other
 
Total
March 31, 2016
$
(25,177
)
 
$
(6,179
)
 
$
(576
)
 
$
(10,223
)
 
$
(42,155
)
Impairments
(8,706
)
 
—

 
—

 
—

 
(8,706
)
March 31, 2017
(33,883
)
 
(6,179
)
 
(576
)
 
(10,223
)
 
(50,861
)
Impairments
—

 
—

 
—

 
—

 
—

March 31, 2018
$
(33,883
)
 
$
(6,179
)
 
$
(576
)
 
$
(10,223
)
 
$
(50,861
)
Schedule of other intangible assets
Intangible assets by type were as follows (in thousands):
 
Client
contracts
 
Client
relationships
 
Trade name and trademarks
 
Internally developed software
 
Licenses
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross Carrying Amount
March 31, 2016
$
8,170

 
$
12,779

 
$
5,008

 
$
1,149

 
$
752

 
$
27,858

Foreign currency translation
(1
)
 
(27
)
 
(525
)
 
(87
)
 
(6
)
 
(646
)
March 31, 2017
8,169

 
12,752

 
4,483

 
1,062

 
746

 
27,212

Foreign currency translation
—

 
25

 
395

 
45

 
9

 
474

March 31, 2018
$
8,169

 
$
12,777

 
$
4,878

 
$
1,107

 
$
755

 
$
27,686

 
 
 
 
 
 
 
 
 
 
 
 
 
Accumulated Amortization
March 31, 2016
$
(8,062
)
 
$
(10,600
)
 
$
(636
)
 
$
(480
)
 
$
(601
)
 
$
(20,379
)
Amortization expense
(93
)
 
(471
)
 
(272
)
 
(205
)
 
(56
)
 
(1,097
)
March 31, 2017
(8,155
)
 
(11,071
)
 
(908
)
 
(685
)
 
(657
)
 
(21,476
)
Amortization expense
(14
)
 
(301
)
 
(305
)
 
(230
)
 
(62
)
 
(912
)
March 31, 2018
$
(8,169
)
 
$
(11,372
)
 
$
(1,213
)
 
$
(915
)
 
$
(719
)
 
$
(22,388
)
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average remaining contractual life, in years
0.0

 
4.7

 
12.0

 
0.8

 
0.6

 
5.8
Schedule of expected amortization expense
Future amortization expense of intangible assets for each of the fiscal years ending March 31 are as follows (in thousands):
 
2019
$
780

2020
476

2021
476

2022
476

2023
477

Thereafter
2,613

 
$
5,298
Schedule of loss on impairment
Loss on impairment includes the following (in thousands):
 
 
Fiscal Year Ended March 31,
 
 
 
2018
 
2017
 
2016
 
 
Impairment of inventories
$
5,717

 
$
7,572

 
$
5,439

 
 
Impairment of investment in unconsolidated affiliates
85,683

 
—

 
—

 
 
Impairment of goodwill
—

 
8,706

 
41,579

 
 
Impairment of other long-lived assets
—

 
—

 
8,086

 
 
 
$
91,400

 
$
16,278

 
$
55,104

 
Schedule of other accrued liabilities
Other accrued liabilities of $66.0 million and $46.7 million as of March 31, 2018 and 2017, respectively, includes the following (in thousands):
 
March 31,
 
2018
 
2017
Accrued lease costs
$
11,708

 
$
5,601

Deferred OEM cost recovery (1)
8,082

 
—

Eastern overdraft liability
8,989

 
5,829

Accrued property and equipment
4,874

 
3,546

Deferred gain on sale leasebacks
1,305

 
1,655

Other operating accruals
31,020

 
30,048

 
$
65,978

 
$
46,679

_______________
(1) 
See Note 3 for further details on deferred original equipment manufacturer (“OEM”) cost recovery.
Schedule of interest (expense), net
During fiscal years 2018, 2017 and 2016, interest expense, net consisted of the following (in thousands):
 
 
Fiscal Year Ended March 31,
 
 
 
2018
 
2017
 
2016
 
 
Interest income
$
677

 
$
943

 
$
1,058

 
 
Interest expense
(77,737
)
 
(50,862
)
 
(35,186
)
 
 
Interest expense, net
$
(77,060
)
 
$
(49,919
)
 
$
(34,128
)