Condensed Consolidating Financial Statements Cash Flow (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net cash provided by (used in) operating activities	$ 42,144	$ (557)
Investing activities:
Capital expenditures	(15,011)	(14,120)
Proceeds from sale of assets	0	898
Acquisitions, net of cash received	0	(2,892)
Net cash provided by (used in) investing activities	(15,011)	(16,114)
Financing activities:
Proceeds from revolving line of credit	0	10,000
Payments of revolving line of credit	0	(5,500)
Payments on long-term obligations	(2,428)	(481)
Proceeds from exercise of stock options	69
Purchase of treasury stock	(1,052)	(691)
Net cash provided by (used in) financing activities	(3,411)	3,328
Net increase (decrease) in cash and cash equivalents	23,722	(13,343)
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign currency fluctuations on cash	(1,370)	139
Cash and cash equivalents at beginning of fiscal period	65,004	56,362
Cash and cash equivalents at end of fiscal period	87,356	43,158
Reclassifications and Eliminations
Operating Activities:
Net cash provided by (used in) operating activities	0	0
Investing activities:
Capital expenditures	0	0
Proceeds from sale of assets		0
Acquisitions, net of cash received		0
Net cash provided by (used in) investing activities	0	0
Financing activities:
Proceeds from revolving line of credit		0
Payments of revolving line of credit		0
Payments on long-term obligations	0	0
Proceeds from exercise of stock options	0
Purchase of treasury stock	0	0
Net cash provided by (used in) financing activities	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign currency fluctuations on cash	0	0
Cash and cash equivalents at beginning of fiscal period	0	0
Cash and cash equivalents at end of fiscal period	0	0
Parent
Operating Activities:
Net cash provided by (used in) operating activities	2,942	691
Investing activities:
Capital expenditures	0	0
Proceeds from sale of assets		0
Acquisitions, net of cash received		0
Net cash provided by (used in) investing activities	0	0
Financing activities:
Proceeds from revolving line of credit		0
Payments of revolving line of credit		0
Payments on long-term obligations	(1,870)	0
Proceeds from exercise of stock options	69
Purchase of treasury stock	(1,052)	(691)
Net cash provided by (used in) financing activities	(2,853)	(691)
Net increase (decrease) in cash and cash equivalents	89	0
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign currency fluctuations on cash	0	0
Cash and cash equivalents at beginning of fiscal period	640	640
Cash and cash equivalents at end of fiscal period	729	640
Guarantor Subsidiaries
Operating Activities:
Net cash provided by (used in) operating activities	14,962	(8,085)
Investing activities:
Capital expenditures	(5,133)	(6,221)
Proceeds from sale of assets		247
Acquisitions, net of cash received		(2,892)
Net cash provided by (used in) investing activities	(5,133)	(8,866)
Financing activities:
Proceeds from revolving line of credit		8,000
Payments of revolving line of credit		(5,500)
Payments on long-term obligations	0	0
Proceeds from exercise of stock options	0
Purchase of treasury stock	0	0
Net cash provided by (used in) financing activities	0	2,500
Net increase (decrease) in cash and cash equivalents	9,829	(14,451)
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign currency fluctuations on cash	0	0
Cash and cash equivalents at beginning of fiscal period	36,209	33,094
Cash and cash equivalents at end of fiscal period	46,038	18,643
Non-Guarantor Subsidiaries
Operating Activities:
Net cash provided by (used in) operating activities	24,240	6,837
Investing activities:
Capital expenditures	(9,878)	(7,899)
Proceeds from sale of assets		651
Acquisitions, net of cash received		0
Net cash provided by (used in) investing activities	(9,878)	(7,248)
Financing activities:
Proceeds from revolving line of credit		2,000
Payments of revolving line of credit		0
Payments on long-term obligations	(558)	(481)
Proceeds from exercise of stock options	0
Purchase of treasury stock	0	0
Net cash provided by (used in) financing activities	(558)	1,519
Net increase (decrease) in cash and cash equivalents	13,804	1,108
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign currency fluctuations on cash	(1,370)	139
Cash and cash equivalents at beginning of fiscal period	28,155	22,628
Cash and cash equivalents at end of fiscal period	$ 40,589	$ 23,875