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RETIREMENT PLANS: - (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Matching contribution of first 6% of employees' annual aggregate contributions (as a percent )	100.00%	50.00%
Percentage of employees' contributions matched by the company	6.00%	6.00%
Contributions to qualified 401(k) and SNQDC plans		$ 2,900	$ 1,900	$ 1,500
Liabilities of non-qualified retirement plan (see Note 6 - Other Current and Noncurrent Assets)		14,970	13,551
SNQDC Plan
Defined Contribution Plan Disclosure [Line Items]
Assets of non-qualified retirement plan		15,000	15,000
Liabilities of non-qualified retirement plan (see Note 6 - Other Current and Noncurrent Assets)		$ 13,600	$ 13,600

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Assets Of Non-Qualified Retirement Plan

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Liability, Non-Qualified Retirement Plan

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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