STOCKHOLDERS' EQUITY: Future expense, by award type (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Share-based compensation
Future expense for performance stock option units	$ 144,500
2020
Share-based compensation
Future expense for performance stock option units	61,300
2021
Share-based compensation
Future expense for performance stock option units	44,600
2022
Share-based compensation
Future expense for performance stock option units	32,500
2023
Share-based compensation
Future expense for performance stock option units	6,100
Stock options
Share-based compensation
Future share-based compensation expense	2,700
Stock options \| 2020
Share-based compensation
Future share-based compensation expense	2,200
Stock options \| 2021
Share-based compensation
Future share-based compensation expense	500
Stock options \| 2022
Share-based compensation
Future share-based compensation expense	0
Stock options \| 2023
Share-based compensation
Future share-based compensation expense	0
Restricted stock units
Share-based compensation
Future share-based compensation expense, share-based awards other than options	91,900
Restricted stock units \| 2020
Share-based compensation
Future share-based compensation expense, share-based awards other than options	40,700
Restricted stock units \| 2021
Share-based compensation
Future share-based compensation expense, share-based awards other than options	28,300
Restricted stock units \| 2022
Share-based compensation
Future share-based compensation expense, share-based awards other than options	16,800
Restricted stock units \| 2023
Share-based compensation
Future share-based compensation expense, share-based awards other than options	6,100
Arbor Holdback Agreement \| Arbor
Share-based compensation
Future share-based compensation expense, share-based awards other than options	2,600
Arbor Holdback Agreement \| Arbor \| 2020
Share-based compensation
Future share-based compensation expense, share-based awards other than options	2,600
Arbor Holdback Agreement \| Arbor \| 2021
Share-based compensation
Future share-based compensation expense, share-based awards other than options	0
Arbor Holdback Agreement \| Arbor \| 2022
Share-based compensation
Future share-based compensation expense, share-based awards other than options	0
Arbor Holdback Agreement \| Arbor \| 2023
Share-based compensation
Future share-based compensation expense, share-based awards other than options	0
Pacific Data Partners, LLC Agreement Plan \| Pacific Data Partners LLC
Share-based compensation
Future share-based compensation expense, share-based awards other than options	47,300
Pacific Data Partners, LLC Agreement Plan \| Pacific Data Partners LLC \| 2020
Share-based compensation
Future share-based compensation expense, share-based awards other than options	15,800
Pacific Data Partners, LLC Agreement Plan \| Pacific Data Partners LLC \| 2021
Share-based compensation
Future share-based compensation expense, share-based awards other than options	15,800
Pacific Data Partners, LLC Agreement Plan \| Pacific Data Partners LLC \| 2022
Share-based compensation
Future share-based compensation expense, share-based awards other than options	15,700
Pacific Data Partners, LLC Agreement Plan \| Pacific Data Partners LLC \| 2023
Share-based compensation
Future share-based compensation expense, share-based awards other than options	$ 0

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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