CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 1,376.0	$ 1,577.2	$ 1,448.2
Cost of sales	1,167.4	1,320.6	1,215.9
Gross profit	208.6	256.6	232.3
Selling, general and administrative expenses	166.3	186.6	185.9
Impairment charges	25.9	2.5	3.5
Restructuring expenses	17.0	0	0
Operating (loss) income	(0.6)	67.5	42.9
Interest expense	(12.6)	(12.5)	(33.7)
Other income (expense) - net	0.2	(7.1)	3.6
(Loss) earnings from continuing operations before income taxes	(13.0)	47.9	12.8
Provision for income taxes	(9.8)	(9.9)	(4.5)
(Loss) earnings from continuing operations	(22.8)	38.0	8.3
Earnings (loss) from discontinued operations, net of income taxes	0	0.8	(3.1)
Net (loss) earnings	(22.8)	38.8	5.2
Net earnings attributable to noncontrolling interest	(1.4)	(0.3)	0
Net (loss) earnings attributable to Modine	$ (24.2)	$ 38.5	$ 5.2
(Loss) earnings per share from continuing operations attributable to Modine shareholders:
Basic (in dollars per share)	$ (0.52)	$ 0.81	$ 0.18
Diluted (in dollars per share)	$ (0.52)	$ 0.80	$ 0.18
Net (loss) earnings per share attributable to Modine shareholders:
Basic (in dollars per share)	$ (0.52)	$ 0.83	$ 0.11
Diluted (in dollars per share)	$ (0.52)	$ 0.82	$ 0.11
Weighted average shares outstanding:
Basic (in shares)	46.6	46.5	46.2
Diluted (in shares)	46.6	46.9	46.7