RESTRUCTURING ACTIVITIES - Restructuring Activities - Restructuring Expenses and Related Costs (Details) $ in Thousands	3 Months Ended
	Jun. 27, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,579
ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,462
Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,674
Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	222
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	221
Total cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,675
Total cost of sales | ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	447
Total cost of sales | Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,061
Total cost of sales | Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	167
Total cost of sales | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,904
Total selling, general and administrative expenses | ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,015
Total selling, general and administrative expenses | Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	613
Total selling, general and administrative expenses | Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	55
Total selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	221
Severance | Total cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	534
Severance | Total cost of sales | ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	399
Severance | Total cost of sales | Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Severance | Total cost of sales | Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	135
Severance | Total cost of sales | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Severance | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,131
Severance | Total selling, general and administrative expenses | ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	242
Severance | Total selling, general and administrative expenses | Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	613
Severance | Total selling, general and administrative expenses | Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	55
Severance | Total selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	221
Other cash restructuring expenses | Total cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	883
Other cash restructuring expenses | Total cost of sales | ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	48
Other cash restructuring expenses | Total cost of sales | Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	803
Other cash restructuring expenses | Total cost of sales | Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	32
Other cash restructuring expenses | Total cost of sales | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Other cash restructuring expenses | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	773
Other cash restructuring expenses | Total selling, general and administrative expenses | ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	773
Other cash restructuring expenses | Total selling, general and administrative expenses | Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Other cash restructuring expenses | Total selling, general and administrative expenses | Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Other cash restructuring expenses | Total selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Asset impairments | Total cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,258
Asset impairments | Total cost of sales | ESS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Asset impairments | Total cost of sales | Utility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,258
Asset impairments | Total cost of sales | Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0
Asset impairments | Total cost of sales | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0