Consolidated Statements of Earnings (Loss) and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
REVENUES
Fee-based revenue (Note 15)	$ 135,356	$ 163,325	$ 146,053
Optimization, net (Note 15)	72,040	(22,630)	122,528
Total revenues	207,396	140,695	268,581
EXPENSES (INCOME)
Operating	40,834	32,535	43,978
General and administrative	39,937	38,562	28,582
Depreciation and amortization (Notes 4 and 5)	41,286	50,409	46,132
Interest (Notes 6 and 16)	66,315	67,010	74,630
Loss on extinguishment of debt (Notes 6, 7 and 17)	36,697	599	4,861
Impairment of goodwill (Note 5)			250,000
Loss on impairment and sale of assets (Note 4)		14,927	5,342
Foreign exchange losses (gains)	1,182	(694)	682
Other expenses (income)	358	(110)	(167)
EARNINGS (LOSS) BEFORE INCOME TAXES	(19,213)	(62,543)	(185,459)
Income tax expense (benefit) (Note 11)
Current	82	(1,414)	412
Deferred	(10,338)	(17,528)	(20,099)
Income tax (benefit) expense	(10,256)	(18,942)	(19,687)
NET EARNINGS (LOSS) AND COMPREHENSIVE INCOME (LOSS)	(8,957)	(43,601)	(165,772)
Net earnings (loss) allocated to:
Managing Member	(171)	(863)	(3,283)
Common unitholders	(8,786)	(21,584)	(82,063)
Subordinated unitholder (Notes 1 and 14)		$ (21,154)	$ (80,426)
Earnings (loss) per unit allocated to common unitholders
basic (in dollars per unit)	$ (0.25)	$ (0.63)	$ (2.39)
diluted (in dollars per unit)	$ (0.25)	$ (0.63)	$ (2.39)
Earnings (loss) per unit allocated to subordinated unitholders (Notes 1 and 14)
basic (in dollars per unit) (Notes 1 and 14)		$ (0.63)	$ (2.39)
diluted (in dollars per unit) (Notes 1 and 14)		$ (0.63)	$ (2.39)