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RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	$ 2,035	$ 1,800
Restructuring reserve	6,000
Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	2,000
Restructuring Activity 2020 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			$ 3,400
Restructuring Activity 2019 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments				$ 7,700
Restructuring Activity 2018 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments					$ 2,700
Restructuring Activity 2017 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						$ 3,000
Restructuring Activity 2015 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments							$ 9,300
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	400
Employee Severance | Restructuring Activity 2018 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments					200
Employee Severance | Restructuring Activity 2015 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments							2,600
Termination Of Associates | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	1,000
Termination Of Associates | Restructuring Activity 2020 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			1,100
Termination Of Associates | Restructuring Activity 2019 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments				800
Termination Of Associates | Restructuring Activity 2018 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments					$ 2,500
Termination Of Associates | Restructuring Activity 2017 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						3,000
Leased office facilities | Restructuring Activity 2017 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						1,500
Adjustments to estimates related to the fiscal 2015 lease accruals | Restructuring Activity 2017 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						$ 1,500
Contract Termination | Restructuring Activity 2015 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments							4,700
Leasehold Improvement Write Offs | Restructuring Activity 2019 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments				800
Leasehold Improvement Write Offs | Restructuring Activity 2015 | Gains Losses And Other Items Net
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments							$ 2,000
United States and Europe | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	1,000
United States | Employee Severance | Restructuring Activity 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			1,700
Asia-Pacific | Employee Severance | Restructuring Activity 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			600
Restructuring reserve			$ 100
United States Australia China And Europe | Employee Severance | Restructuring Activity 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments				$ 6,100
United States Australia China And Europe | Employee Severance | Restructuring Activity 2015
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 200

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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-Publisher FASB
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