Acquisitions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 160,185,000	$ 170,106,000	$ 486,849,000	$ 510,642,000
Total	182,467,000		182,467,000
Goodwill	181,991,000		181,991,000		$ 121,461,000
Business Acquisition, Pro Forma Net Income (Loss)	$ 7,911,000	$ 9,397,000	$ 16,514,000	$ 25,450,000
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.39	$ 0.47	$ 0.82	$ 1.28
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.39	$ 0.46	$ 0.81	$ 1.26
Stahlhammer Bommern GmbH [Member]
Business Acquisition [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period			$ 16,000,000
Working capital	$ 9,444,000		9,444,000
Acquired Finite-lived Intangible Asset, Residual Value	4,561,000		4,561,000
Long-Lived Assets	67,000		67,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(6,487,000)		(6,487,000)
Goodwill	7,818,000		7,818,000
Long term debt	(3,596,000)		(3,596,000)
Goodwill	(1,669,000)		(1,669,000)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	25,423,000		25,423,000
Magnetek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	8,205,000		8,205,000
Intangible Assets, Gross (Excluding Goodwill)	105,998,000		105,998,000
Liabilities, Other than Long-term Debt, Noncurrent	(44,052,000)		(44,052,000)
Deferred Tax Assets, Net	29,359,000		29,359,000
Working capital	19,660,000		19,660,000
Property, plant and equipment	5,660,000		5,660,000
Long-Lived Assets	3,921,000		3,921,000
Goodwill	61,921,000		61,921,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	190,672,000		190,672,000
Stahlhammer Bommern GmbH [Member]
Business Acquisition [Line Items]
Goodwill					$ 7,818,000
Stahlhammer Bommern GmbH [Member]
Business Acquisition [Line Items]
Property, plant and equipment	$ 13,616,000		$ 13,616,000