COMMITMENTS - General Information (Details)			12 Months Ended
	Apr. 01, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jan. 31, 2016 USD ($) item	Jan. 31, 2015 USD ($)	Jan. 31, 2014 USD ($)
Commitments
The number of option terms remaining | item			1
The period of the option terms			2 years
Selling, General and Administrative Expenses
Commitments
Rent expense included in selling, general and administrative expenses of continuing operations			$ 331,000	$ 195,000	$ 171,000
Costs of Revenues
Commitments
Rent incurred on construction projects included in the costs of revenues			$ 15,004,000	$ 14,413,000	$ 3,612,000
Roberts
Commitments
Annual lease amount for primary offices and plant		$ 400,000
Amended annual lease amount for primary offices and plant	$ 300,000