SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION BS (Details) - USD ($)
$ in Thousands |
Jun. 30, 2015 |
Mar. 31, 2015 |
Jun. 30, 2014 |
Mar. 31, 2014 |
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Cash and cash equivalents |
$ 120,394
|
$ 104,146
|
$ 133,804
|
$ 204,341
|
| Accounts Receivable, Net, Current |
258,277
|
258,618
|
|
|
| Inventories |
151,947
|
147,169
|
|
|
| Assets held for sale |
38,636
|
57,827
|
|
|
| Prepaid expenses and other current assets |
60,640
|
70,091
|
|
|
| Total current assets |
629,894
|
637,851
|
|
|
| Intercompany investment |
0
|
0
|
|
|
| Investment in unconsolidated affiliates |
223,233
|
216,376
|
|
|
| Intercompany notes receivable |
0
|
0
|
|
|
| Total property and equipment, at cost |
2,653,032
|
2,665,828
|
|
|
| Less - Accumulated depreciation and amortization |
(506,860)
|
(508,727)
|
|
|
| Property, Plant and Equipment, Net |
2,146,172
|
2,157,101
|
|
|
| Goodwill |
77,998
|
75,628
|
|
|
| Other assets |
165,394
|
143,764
|
|
|
| Total assets |
3,242,691
|
3,230,720
|
|
|
| Accounts payable |
98,253
|
84,193
|
|
|
| Accrued liabilities |
243,491
|
258,445
|
|
|
| Current deferred taxes |
4,133
|
17,704
|
|
|
| Short-term borrowings and current maturities of long-term debt |
26,954
|
18,730
|
|
|
| Deferred sale leaseback advance |
0
|
55,934
|
|
|
| Total current liabilities |
372,831
|
435,006
|
|
|
| Long-term debt, less current maturities |
918,247
|
845,692
|
|
|
| Intercompany notes payable |
0
|
0
|
|
|
| Accrued pension liabilities |
101,911
|
99,576
|
|
|
| Other liabilities and deferred credits |
31,224
|
39,782
|
|
|
| Deferred taxes |
169,380
|
165,655
|
|
|
| Redeemable noncontrolling interests |
35,342
|
26,223
|
|
|
| Common stock |
376
|
376
|
|
|
| Additional paid-in capital |
782,620
|
781,837
|
|
|
| Retained earnings |
1,263,013
|
1,284,442
|
|
|
| Accumulated other comprehensive income (loss) |
(255,615)
|
(270,329)
|
|
|
| Treasury shares, at cost |
(184,796)
|
(184,796)
|
|
|
| Total Bristow Group stockholders' equity |
1,605,598
|
1,611,530
|
|
|
| Noncontrolling interests |
8,158
|
7,256
|
|
|
| Total stockholders' investment |
1,613,756
|
1,618,786
|
|
|
| Total liabilities, redeemable noncontrolling interests and stockholders’ investment |
3,242,691
|
3,230,720
|
|
|
| Parent Company [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Cash and cash equivalents |
8,467
|
126
|
6,660
|
4,640
|
| Accounts Receivable, Net, Current |
420,427
|
377,158
|
|
|
| Inventories |
0
|
0
|
|
|
| Assets held for sale |
0
|
0
|
|
|
| Prepaid expenses and other current assets |
4,043
|
4,850
|
|
|
| Total current assets |
432,937
|
382,134
|
|
|
| Intercompany investment |
1,366,976
|
1,410,347
|
|
|
| Investment in unconsolidated affiliates |
0
|
0
|
|
|
| Intercompany notes receivable |
1,227,432
|
1,184,335
|
|
|
| Total property and equipment, at cost |
122,211
|
111,287
|
|
|
| Less - Accumulated depreciation and amortization |
(18,037)
|
(16,431)
|
|
|
| Property, Plant and Equipment, Net |
104,174
|
94,856
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other assets |
167,011
|
43,423
|
|
|
| Total assets |
3,298,530
|
3,115,095
|
|
|
| Accounts payable |
302,985
|
203,700
|
|
|
| Accrued liabilities |
16,116
|
31,805
|
|
|
| Current deferred taxes |
2,572
|
(3,661)
|
|
|
| Short-term borrowings and current maturities of long-term debt |
17,501
|
9,088
|
|
|
| Deferred sale leaseback advance |
0
|
0
|
|
|
| Total current liabilities |
339,174
|
240,932
|
|
|
| Long-term debt, less current maturities |
886,988
|
812,536
|
|
|
| Intercompany notes payable |
100,000
|
100,000
|
|
|
| Accrued pension liabilities |
0
|
0
|
|
|
| Other liabilities and deferred credits |
10,132
|
17,144
|
|
|
| Deferred taxes |
143,708
|
141,771
|
|
|
| Redeemable noncontrolling interests |
0
|
0
|
|
|
| Common stock |
376
|
376
|
|
|
| Additional paid-in capital |
782,620
|
781,837
|
|
|
| Retained earnings |
1,263,013
|
1,284,442
|
|
|
| Accumulated other comprehensive income (loss) |
(44,233)
|
(80,604)
|
|
|
| Treasury shares, at cost |
(184,796)
|
(184,796)
|
|
|
| Total Bristow Group stockholders' equity |
1,816,980
|
1,801,255
|
|
|
| Noncontrolling interests |
1,548
|
1,457
|
|
|
| Total stockholders' investment |
1,818,528
|
1,802,712
|
|
|
| Total liabilities, redeemable noncontrolling interests and stockholders’ investment |
3,298,530
|
3,115,095
|
|
|
| Guarantor Subsidiaries [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Cash and cash equivalents |
0
|
884
|
0
|
0
|
| Accounts Receivable, Net, Current |
444,319
|
342,239
|
|
|
| Inventories |
40,119
|
44,285
|
|
|
| Assets held for sale |
36,362
|
54,695
|
|
|
| Prepaid expenses and other current assets |
6,140
|
7,035
|
|
|
| Total current assets |
526,940
|
449,138
|
|
|
| Intercompany investment |
111,379
|
111,380
|
|
|
| Investment in unconsolidated affiliates |
0
|
0
|
|
|
| Intercompany notes receivable |
13,786
|
0
|
|
|
| Total property and equipment, at cost |
1,093,606
|
1,165,164
|
|
|
| Less - Accumulated depreciation and amortization |
(216,145)
|
(223,245)
|
|
|
| Property, Plant and Equipment, Net |
877,461
|
941,919
|
|
|
| Goodwill |
4,756
|
4,756
|
|
|
| Other assets |
1,001
|
988
|
|
|
| Total assets |
1,535,323
|
1,508,181
|
|
|
| Accounts payable |
460,061
|
369,854
|
|
|
| Accrued liabilities |
39,276
|
37,860
|
|
|
| Current deferred taxes |
1,917
|
2,503
|
|
|
| Short-term borrowings and current maturities of long-term debt |
0
|
0
|
|
|
| Deferred sale leaseback advance |
0
|
55,934
|
|
|
| Total current liabilities |
501,254
|
466,151
|
|
|
| Long-term debt, less current maturities |
0
|
0
|
|
|
| Intercompany notes payable |
122,897
|
131,075
|
|
|
| Accrued pension liabilities |
0
|
0
|
|
|
| Other liabilities and deferred credits |
7,670
|
8,379
|
|
|
| Deferred taxes |
6,140
|
6,346
|
|
|
| Redeemable noncontrolling interests |
0
|
0
|
|
|
| Common stock |
4,996
|
4,996
|
|
|
| Additional paid-in capital |
9,291
|
9,291
|
|
|
| Retained earnings |
883,075
|
881,943
|
|
|
| Accumulated other comprehensive income (loss) |
0
|
0
|
|
|
| Treasury shares, at cost |
0
|
0
|
|
|
| Total Bristow Group stockholders' equity |
897,362
|
896,230
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total stockholders' investment |
897,362
|
896,230
|
|
|
| Total liabilities, redeemable noncontrolling interests and stockholders’ investment |
1,535,323
|
1,508,181
|
|
|
| Non-Guarantor Subsidiaries [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Cash and cash equivalents |
112,059
|
103,136
|
129,008
|
200,147
|
| Accounts Receivable, Net, Current |
472,889
|
447,776
|
|
|
| Inventories |
111,828
|
102,884
|
|
|
| Assets held for sale |
2,274
|
3,132
|
|
|
| Prepaid expenses and other current assets |
50,457
|
58,206
|
|
|
| Total current assets |
749,507
|
715,134
|
|
|
| Intercompany investment |
158,843
|
0
|
|
|
| Investment in unconsolidated affiliates |
223,233
|
216,376
|
|
|
| Intercompany notes receivable |
0
|
0
|
|
|
| Total property and equipment, at cost |
1,437,215
|
1,389,377
|
|
|
| Less - Accumulated depreciation and amortization |
(272,678)
|
(269,051)
|
|
|
| Property, Plant and Equipment, Net |
1,164,537
|
1,120,326
|
|
|
| Goodwill |
73,242
|
70,872
|
|
|
| Other assets |
106,390
|
99,353
|
|
|
| Total assets |
2,475,752
|
2,222,061
|
|
|
| Accounts payable |
329,636
|
289,838
|
|
|
| Accrued liabilities |
1,248,960
|
206,789
|
|
|
| Current deferred taxes |
(356)
|
18,862
|
|
|
| Short-term borrowings and current maturities of long-term debt |
9,453
|
9,642
|
|
|
| Deferred sale leaseback advance |
0
|
0
|
|
|
| Total current liabilities |
1,587,693
|
525,131
|
|
|
| Long-term debt, less current maturities |
31,259
|
33,156
|
|
|
| Intercompany notes payable |
152,849
|
1,065,918
|
|
|
| Accrued pension liabilities |
101,911
|
99,576
|
|
|
| Other liabilities and deferred credits |
221,175
|
21,711
|
|
|
| Deferred taxes |
19,532
|
17,538
|
|
|
| Redeemable noncontrolling interests |
35,342
|
26,223
|
|
|
| Common stock |
22,876
|
22,876
|
|
|
| Additional paid-in capital |
284,048
|
284,048
|
|
|
| Retained earnings |
110,692
|
133,559
|
|
|
| Accumulated other comprehensive income (loss) |
(98,235)
|
(13,474)
|
|
|
| Treasury shares, at cost |
0
|
0
|
|
|
| Total Bristow Group stockholders' equity |
319,381
|
427,009
|
|
|
| Noncontrolling interests |
6,610
|
5,799
|
|
|
| Total stockholders' investment |
325,991
|
432,808
|
|
|
| Total liabilities, redeemable noncontrolling interests and stockholders’ investment |
2,475,752
|
2,222,061
|
|
|
| Consolidations, Eliminations [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Cash and cash equivalents |
(132)
|
0
|
$ (1,864)
|
$ (446)
|
| Accounts Receivable, Net, Current |
(1,079,358)
|
(908,555)
|
|
|
| Inventories |
0
|
0
|
|
|
| Assets held for sale |
0
|
0
|
|
|
| Prepaid expenses and other current assets |
0
|
0
|
|
|
| Total current assets |
(1,079,490)
|
(908,555)
|
|
|
| Intercompany investment |
(1,637,198)
|
(1,521,727)
|
|
|
| Investment in unconsolidated affiliates |
0
|
0
|
|
|
| Intercompany notes receivable |
(1,241,218)
|
(1,184,335)
|
|
|
| Total property and equipment, at cost |
0
|
0
|
|
|
| Less - Accumulated depreciation and amortization |
0
|
0
|
|
|
| Property, Plant and Equipment, Net |
0
|
0
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other assets |
(109,008)
|
0
|
|
|
| Total assets |
(4,066,914)
|
(3,614,617)
|
|
|
| Accounts payable |
(994,429)
|
(779,199)
|
|
|
| Accrued liabilities |
(1,060,861)
|
(18,009)
|
|
|
| Current deferred taxes |
0
|
0
|
|
|
| Short-term borrowings and current maturities of long-term debt |
0
|
0
|
|
|
| Deferred sale leaseback advance |
0
|
0
|
|
|
| Total current liabilities |
(2,055,290)
|
(797,208)
|
|
|
| Long-term debt, less current maturities |
0
|
0
|
|
|
| Intercompany notes payable |
(375,746)
|
(1,296,993)
|
|
|
| Accrued pension liabilities |
0
|
0
|
|
|
| Other liabilities and deferred credits |
(207,753)
|
(7,452)
|
|
|
| Deferred taxes |
0
|
0
|
|
|
| Redeemable noncontrolling interests |
0
|
0
|
|
|
| Common stock |
(27,872)
|
(27,872)
|
|
|
| Additional paid-in capital |
(293,339)
|
(293,339)
|
|
|
| Retained earnings |
(993,767)
|
(1,015,502)
|
|
|
| Accumulated other comprehensive income (loss) |
(113,147)
|
(176,251)
|
|
|
| Treasury shares, at cost |
0
|
0
|
|
|
| Total Bristow Group stockholders' equity |
(1,428,125)
|
(1,512,964)
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total stockholders' investment |
(1,428,125)
|
(1,512,964)
|
|
|
| Total liabilities, redeemable noncontrolling interests and stockholders’ investment |
(4,066,914)
|
(3,614,617)
|
|
|
| Land and Building [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
199,082
|
171,959
|
|
|
| Land and Building [Member] | Parent Company [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
2,830
|
2,830
|
|
|
| Land and Building [Member] | Guarantor Subsidiaries [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
55,080
|
50,946
|
|
|
| Land and Building [Member] | Non-Guarantor Subsidiaries [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
141,172
|
118,183
|
|
|
| Land and Building [Member] | Consolidations, Eliminations [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
0
|
0
|
|
|
| Aircraft And Equipment [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
2,453,950
|
2,493,869
|
|
|
| Aircraft And Equipment [Member] | Parent Company [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
119,381
|
108,457
|
|
|
| Aircraft And Equipment [Member] | Guarantor Subsidiaries [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
1,038,526
|
1,114,218
|
|
|
| Aircraft And Equipment [Member] | Non-Guarantor Subsidiaries [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
1,296,043
|
1,271,194
|
|
|
| Aircraft And Equipment [Member] | Consolidations, Eliminations [Member] |
|
|
|
|
| Condensed Financial Statements, Captions [Line Items] |
|
|
|
|
| Total property and equipment, at cost |
$ 0
|
$ 0
|
|
|