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TOPIC 606 ADOPTION IMPACT AND REVENUE FROM CONTRACTS WITH CUSTOMERS: Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 1,669,605,000		$ 628,331,000
Unamortized contract costs	10,700,000
Capitalized contract cost, net	4,300,000
Contract with customer, asset, credit loss expense	$ 0
ASC 606 Adjustments | Adjustments due to Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 12,700,000

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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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