SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION IS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue	$ 381,719,000	$ 419,887,000	$ 446,911,000	$ 466,996,000	$ 450,355,000	$ 460,140,000	$ 475,636,000	$ 472,538,000	$ 1,715,513,000	$ 1,858,669,000	$ 1,669,582,000
Direct cost and reimbursable expense									1,309,365,000	1,299,557,000	1,186,132,000
Intercompany expenses									0	0	0
Depreciation and amortization									136,812,000	114,293,000	95,977,000
General and administrative									224,645,000	254,158,000	199,814,000
Total operating expense									1,670,822,000	1,668,008,000	1,481,923,000
Loss on impairment									(55,104,000)	(7,167,000)	(12,669,000)
Gain (loss) on disposal of assets	(6,800,000)	(2,200,000)	(14,000,000)	(7,700,000)	(10,300,000)	(26,300,000)	100,000	600,000	(30,693,000)	(35,849,000)	(722,000)
Earnings from unconsolidated affiliates, net of losses									261,000	(1,771,000)	12,709,000
Operating income (loss)	(37,923,000)	22,077,000	(29,833,000)	4,834,000	27,702,000	8,916,000	44,064,000	65,192,000	(40,845,000)	145,874,000	186,977,000
Interest expense, net									(34,128,000)	(29,354,000)	(43,218,000)
Extinguishment of debt									0	(2,591,000)	0
Gain on sale of unconsolidated affiliate, net of losses									0	3,921,000	103,924,000
Other income (expense), net									(4,258,000)	(6,377,000)	(2,692,000)
Income (loss) before provision for income taxes									(79,231,000)	111,473,000	244,991,000
Benefit (provision) for income taxes									2,082,000	(22,766,000)	(57,212,000)
Net income (loss)									(77,149,000)	88,707,000	187,779,000
Net (income) loss attributable to noncontrolling interests									4,707,000	(4,407,000)	(1,042,000)
Net income (loss) attributable to Bristow Group	$ (25,255,000)	$ 3,202,000	$ (47,132,000)	$ (3,257,000)	$ 15,077,000	$ (968,000)	$ 26,082,000	$ 44,109,000	(72,442,000)	84,300,000	186,737,000
Accretion of redeemable noncontrolling interests									(1,498,000)	0	0
Net income (loss) available to common stockholders, basic									(73,940,000)	84,300,000	186,737,000
External customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									1,715,513,000	1,858,669,000	1,669,582,000
Intercompany customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Parent Company Only
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	767,000	14,754,000
Direct cost and reimbursable expense									320,000	0	0
Intercompany expenses									0	0	0
Depreciation and amortization									7,137,000	1,834,000	2,835,000
General and administrative									68,787,000	76,453,000	64,891,000
Total operating expense									76,244,000	78,287,000	67,726,000
Loss on impairment									0	0	0
Gain (loss) on disposal of assets									0	0	(45,000)
Earnings from unconsolidated affiliates, net of losses									1,271,000	44,731,000	189,209,000
Operating income (loss)									(74,973,000)	(32,789,000)	136,192,000
Interest expense, net									(30,167,000)	112,336,000	79,972,000
Extinguishment of debt										(2,591,000)
Gain on sale of unconsolidated affiliate, net of losses										0	0
Other income (expense), net									400,000	323,000	(174,000)
Income (loss) before provision for income taxes									(104,740,000)	77,279,000	215,990,000
Benefit (provision) for income taxes									32,355,000	7,080,000	(29,193,000)
Net income (loss)									(72,385,000)	84,359,000	186,797,000
Net (income) loss attributable to noncontrolling interests									(57,000)	(59,000)	(60,000)
Net income (loss) attributable to Bristow Group									(72,442,000)	84,300,000	186,737,000
Accretion of redeemable noncontrolling interests									0
Net income (loss) available to common stockholders, basic									(72,442,000)
Parent Company Only | External customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Parent Company Only | Intercompany customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	767,000	14,754,000
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									317,172,000	391,647,000	382,454,000
Direct cost and reimbursable expense									192,500,000	212,216,000	219,873,000
Intercompany expenses									0	0	0
Depreciation and amortization									60,312,000	46,098,000	43,052,000
General and administrative									27,440,000	39,898,000	33,925,000
Total operating expense									280,252,000	298,212,000	296,850,000
Loss on impairment									(7,264,000)	0	(6,988,000)
Gain (loss) on disposal of assets									(21,579,000)	269,000	4,312,000
Earnings from unconsolidated affiliates, net of losses									0	0	0
Operating income (loss)									8,077,000	93,704,000	82,928,000
Interest expense, net									(3,859,000)	(4,581,000)	(4,785,000)
Extinguishment of debt										0
Gain on sale of unconsolidated affiliate, net of losses										0	0
Other income (expense), net									499,000	483,000	(342,000)
Income (loss) before provision for income taxes									4,717,000	89,606,000	77,801,000
Benefit (provision) for income taxes									(3,546,000)	(1,319,000)	(6,292,000)
Net income (loss)									1,171,000	88,287,000	71,509,000
Net (income) loss attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to Bristow Group									1,171,000	88,287,000	71,509,000
Accretion of redeemable noncontrolling interests									0
Net income (loss) available to common stockholders, basic									1,171,000
Guarantor Subsidiaries | External customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									229,499,000	300,171,000	303,878,000
Guarantor Subsidiaries | Intercompany customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									87,673,000	91,476,000	78,576,000
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									1,486,014,000	1,558,498,000	1,365,704,000
Direct cost and reimbursable expense									1,116,545,000	1,087,341,000	966,259,000
Intercompany expenses									87,673,000	92,243,000	93,330,000
Depreciation and amortization									69,363,000	66,361,000	50,090,000
General and administrative									128,418,000	137,807,000	100,998,000
Total operating expense									1,401,999,000	1,383,752,000	1,210,677,000
Loss on impairment									(47,840,000)	(7,167,000)	(5,681,000)
Gain (loss) on disposal of assets									(9,114,000)	(36,118,000)	(4,989,000)
Earnings from unconsolidated affiliates, net of losses									220,000	(1,815,000)	12,666,000
Operating income (loss)									27,281,000	129,646,000	157,023,000
Interest expense, net									(102,000)	(137,109,000)	(118,405,000)
Extinguishment of debt										0
Gain on sale of unconsolidated affiliate, net of losses										3,921,000	103,924,000
Other income (expense), net									(5,157,000)	(7,183,000)	(2,176,000)
Income (loss) before provision for income taxes									22,022,000	(10,725,000)	140,366,000
Benefit (provision) for income taxes									(26,727,000)	(28,527,000)	(21,727,000)
Net income (loss)									(4,705,000)	(39,252,000)	118,639,000
Net (income) loss attributable to noncontrolling interests									4,764,000	(4,348,000)	(982,000)
Net income (loss) attributable to Bristow Group									59,000	(43,600,000)	117,657,000
Accretion of redeemable noncontrolling interests									(1,498,000)
Net income (loss) available to common stockholders, basic									(1,439,000)
Non-Guarantor Subsidiaries | External customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									1,486,014,000	1,558,498,000	1,365,704,000
Non-Guarantor Subsidiaries | Intercompany customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Eliminations
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									(87,673,000)	(92,243,000)	(93,330,000)
Direct cost and reimbursable expense									0	0	0
Intercompany expenses									(87,673,000)	(92,243,000)	(93,330,000)
Depreciation and amortization									0	0	0
General and administrative									0	0	0
Total operating expense									(87,673,000)	(92,243,000)	(93,330,000)
Loss on impairment									0	0	0
Gain (loss) on disposal of assets									0	0	0
Earnings from unconsolidated affiliates, net of losses									(1,230,000)	(44,687,000)	(189,166,000)
Operating income (loss)									(1,230,000)	(44,687,000)	(189,166,000)
Interest expense, net									0	0	0
Extinguishment of debt										0
Gain on sale of unconsolidated affiliate, net of losses										0	0
Other income (expense), net									0	0	0
Income (loss) before provision for income taxes									(1,230,000)	(44,687,000)	(189,166,000)
Benefit (provision) for income taxes									0	0	0
Net income (loss)									(1,230,000)	(44,687,000)	(189,166,000)
Net (income) loss attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to Bristow Group									(1,230,000)	(44,687,000)	(189,166,000)
Accretion of redeemable noncontrolling interests									0
Net income (loss) available to common stockholders, basic									(1,230,000)
Eliminations | External customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									0	0	0
Eliminations | Intercompany customer
Condensed Financial Statements, Captions [Line Items]
Total consolidated gross revenue									$ (87,673,000)	$ (92,243,000)	$ (93,330,000)