QUARTERLY FINANCIAL INFORMATION (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Unusual or Infrequent Item [Line Items]
Revenues	$ 440,925,000	$ 412,335,000	$ 417,328,000	$ 398,994,000	$ 391,642,000	$ 388,469,000	$ 365,754,000	$ 362,608,000	$ 1,669,582,000	$ 1,508,473,000	$ 1,341,803,000
Operating income	47,421,000	29,502,000	53,935,000	56,119,000	62,703,000	74,120,000	47,328,000	39,993,000	186,977,000	224,144,000	115,766,000
Net income attributable to Bristow Group	30,318,000	18,927,000	110,606,000	26,886,000	40,380,000	36,392,000	29,668,000	23,662,000	186,737,000	130,102,000	63,530,000
Earnings Per Share, Basic	$ 0.84	$ 0.52	$ 3.04	$ 0.74	$ 1.12	$ 1.01	$ 0.83	$ 0.66	$ 5.15	$ 3.61	$ 1.76
Diluted earnings per share	$ 0.83	$ 0.51	$ 3.01	$ 0.74	$ 1.11	$ 1.00	$ 0.82	$ 0.65	$ 5.09	$ 3.57	$ 1.73
Extinguishment of debt									0	(14,932,000)	0
Write off of deferred debt issuance cost						(2,600,000)			(12,733,000)	(4,642,000)	0
Number of aircraft sold or disposed of					10				46	27	38
Gain (loss) on disposal of assets	100,000	4,000,000	(3,100,000)	(1,700,000)	7,200,000	7,400,000	(1,300,000)	(5,300,000)	(722,000)	8,068,000	(31,670,000)
Senior Notes Due 2017 [Member]
Unusual or Infrequent Item [Line Items]
Write off of deferred debt issuance cost										(2,600,000)
Three Hundred Sixty Four Day Term Loan And Credit Facility [Member]
Unusual or Infrequent Item [Line Items]
Write off of deferred debt issuance cost										(2,100,000)
North America [Member]
Unusual or Infrequent Item [Line Items]
Revenues									230,340,000	226,397,000	177,817,000
Operating income									32,255,000	27,538,000	8,378,000
Cancellation Of Potential Financing [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Net Income Impact Net				(8,300,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net				$ (0.23)
Inventory Valuation Reserve [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net	(10,500,000)		(1,500,000)	(800,000)	(2,800,000)
Unusual Or Infrequent Item Net Income Impact Net	(8,400,000)		(1,000,000)	(500,000)	(2,200,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net	$ (0.23)		$ (0.03)	$ (0.01)	$ (0.06)
Business Restructuring Reserves [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net	(800,000)	(2,100,000)	(500,000)
Unusual Or Infrequent Item Net Income Impact Net	(500,000)	(1,400,000)	(400,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net	$ (0.01)	$ (0.04)	$ (0.01)
Contract Termination [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net		(2,100,000)						(2,200,000)
Unusual Or Infrequent Item Net Income Impact Net		(1,600,000)						(1,700,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net		$ (0.04)						$ 0.05
Tax Amnesty [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net	4,200,000	(19,300,000)
Unusual Or Infrequent Item Net Income Impact Net	2,800,000	(12,600,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net	$ 0.08	$ (0.34)
Adjustments For Error Correction [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net							2,300,000
Unusual Or Infrequent Item Net Income Impact Net							1,500,000
Unusual or Infrequent Item, Earnings Per Share Impact, Net							$ 0.04
Early Retirement Of Debt [Member] | Senior Notes Due 2017 [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Net Income Impact Net						(11,400,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net						$ (0.31)
Early Retirement Of Debt [Member] | Three Hundred Sixty Four Day Term Loan And Credit Facility [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Net Income Impact Net					(600,000)	(1,000,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net					$ (0.01)	$ (0.03)
Unexecuted Sale [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net					900,000
Unusual Or Infrequent Item Net Income Impact Net					700,000
Unusual or Infrequent Item, Earnings Per Share Impact, Net					$ 0.02
Disposal Of Assets Member [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Net Income Impact Net	100,000	3,100,000	(2,400,000)	(1,300,000)	5,500,000	6,100,000	(1,000,000)	(4,200,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net	$ 0.00	$ 0.09	$ (0.07)	$ (0.04)	$ 0.15	$ 0.17	$ (0.03)	$ (0.12)
Employee Severance [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net	(4,800,000)
Unusual Or Infrequent Item Net Income Impact Net	(3,100,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net	$ (0.09)
Damage from Fire, Explosion or Other Hazard [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net	(8,600,000)
Unusual Or Infrequent Item Net Income Impact Net	(6,600,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net	$ (0.18)
Goodwill [Member]
Unusual or Infrequent Item [Line Items]
Unusual Or Infrequent Item Operating Income Impact Net	(600,000)
Unusual Or Infrequent Item Net Income Impact Net	$ (400,000)
Unusual or Infrequent Item, Earnings Per Share Impact, Net	$ (0.01)