Debt (Tables)

12 Months Ended

Dec. 30, 2017

Debt Disclosure [Abstract]

Schedule of Debt

(In thousands)	2017			2016
Subordinated Debentures with interest at 6.00%, due 2027	$	284,536		$	—
Revolving Credit Facility with interest at 3.06%, due 2021	160,000			200,000
Jungwoo-Mueller credit facility with interest at 2.72%, due 2018	5,119			4,724
Jungwoo-Mueller credit facility with interest at 3.19%, due 2017	8,648			7,990
2001 Series IRB's with interest at 2.22%, due 2021	3,250			4,250
Mueller-Xingrong credit facility	—			3,048
Other	4,694			8,309
	466,247			228,321
Less debt issuance costs	(1,175		)	(957		)
Less current portion of debt	(16,480		)	(13,655		)
Long-term debt	$	448,592		$	213,709

Debt instrument redemption

If redeemed during the 12-month period beginning March 9:

Year	Redemption Price
2017	106%
2018	105
2019	104
2020	103
2021	102
2022 and thereafter	100

Aggregate annual maturities of debt

Aggregate annual maturities of the Company’s debt are as follows:

(In thousands)	Amount
2018	$	16,480
2019	1,222
2020	1,222
2021	160,472
2022	222
Thereafter	286,629
Long-term debt	$	466,247

Net interest expense

Net interest expense consisted of the following:

(In thousands)	2017			2016			2015
Interest expense	$	19,716		$	7,749		$	8,335
Capitalized interest	(214		)	(362		)	(668		)
	$	19,502		$	7,387		$	7,667