Note 19 - Long-term Debt and Financing (Tables)

12 Months Ended

Mar. 31, 2019

Statement Line Items [Line Items]

Disclosure of detailed information about borrowings [text block]

	Maturity	March 31, 2019			March 31, 2018
Credit facility (a)	September 1, 2020	$	201,577		$	122,115
Less: Debt issue costs (a)			(1,824	)		(664	)
Filter Group financing (b)			17,577			-
8.75% loan (c)	September 12, 2023		240,094			-
6.75% $100M convertible debentures (d)	March 31, 2023		87,520			85,760
6.75% $160M convertible debentures (e)	December 31, 2021		150,945			148,146
6.5% convertible bonds (f)	July 29, 2019		29,483			188,147
			725,372			543,504
Less: Current portion			(37,429	)		(121,451	)
		$	687,943		$	422,053

Disclosure of maturity of debt [text block]

	Less than 1 year		1–3 years		4–5 years		More than 5 years		Total
Credit facility (a)	$	-	$	201,577	$	-	$	-	$	201,577
Filter Group financing (b)		9,217		8,987		1,186		-		19,390
8.75% loan (c)		-		-		270,801		-		270,801
6.75% $100M convertible debentures (d)		-		-		100,000		-		100,000
6.75% $160M convertible debentures (e)		-		-		160,000		-		160,000
6.5% convertible bonds (f)		29,933		-		-		-		29,933
	$	39,150	$	210,564	$	531,987	$	-	$	781,701

Disclosure of reconciliation of liabilities arising from financing activities [text block]

	As at April 1, 2018			Cash inflows/ (outflows)			Foreign exchange		Non-cash changes			As at March 31, 2019
Credit facility (a)	$	121,451		$	77,638		$	-	$	664		$	199,753
Filter Group financing (b)		-			17,577			-		-			17,577
8.75% loan (c)		-			236,934			4,553		(1,393	)		240,094
6.75% $100M convertible debentures (d)		85,760			-			-		1,760			87,520
6.75% $160M convertible debentures (e)		148,146			-			-		2,799			150,945
6.5% convertible bonds (f)		188,147			(169,333	)		3,508		7,161			29,483
	$	543,504		$	162,816		$	8,061	$	10,991		$	725,372
Less: Current portion		(121,451	)		-			-		-			(37,429	)
	$	422,053		$	162,816		$	8,061	$	10,991		$	687,943

	As at April 1, 2017		Cash inflows/ (outflows)			Foreign exchange			Non-cash changes			As at March 31, 2018
Credit facility (a)	$	66,001	$	53,857		$	-		$	1,593		$	121,451
6.75% $100M convertible debentures (d)		-		95,869			-			(10,109	)		85,760
6.75% $160M convertible debentures (e)		145,579		-			-			2,567			148,146
6.5% convertible bonds (f)		190,486		-			(6,101	)		3,762			188,147
5.75% convertible debentures (g)		96,022		(100,000	)		-			3,978			-
	$	498,088	$	49,726		$	(6,101	)	$	1,791		$	543,504
Less: Current portion		-		-			-			-			(121,451	)
	$	498,088	$	49,726		$	(6,101	)	$	1,791		$	422,053

Disclosure of finance cost [text block]

	2019		2018
Credit facility (a)	$	20,715	$	12,883
Filter Group financing (b)		875		-
8.75% loan (c)		8,999		-
6.75% $100M convertible debentures (d)		8,819		497
6.75% $160M convertible debentures (e)		13,598		12,773
6.5% convertible bonds (f)		18,387		15,753
5.75% convertible debentures (g)		-		9,173
Collateral management and others (h)		16,679		4,893
	$	88,072	$	55,972