Stockholders' Equity - Capital Stock, Cash Dividend and Share Repurchases (Details)				5 Months Ended	10 Months Ended	12 Months Ended
	May 21, 2019 $ / shares	Apr. 16, 2019 USD ($)	Apr. 01, 2019 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) vote $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Oct. 31, 2016 USD ($)	Jun. 01, 2018 USD ($)
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares					750,000,000	750,000,000	750,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0.01	$ 0.01	$ 0.01
Preferred stock, authorized (in shares) | shares					1,000,000	1,000,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.01	$ 0.01
Votes per share | vote						1
Amount of cash dividend declared						$ 33,000,000
Payments of dividends				$ 0		$ 25,000,000	$ 0	$ 0
Cash dividend per common share (in dollars per share) | $ / shares					$ 0.20
Amount authorized in share repurchase program									$ 400,000,000
Number of shares repurchased during period (in shares) | shares						2,700,000
Value of stock repurchased during period					$ 60,000,000	$ 60,000,000
Payment for repurchase of common stock (less than)			$ 1,000,000	$ 0		59,000,000	$ 0	$ 0
Remaining shares authorized to be repurchased					$ 340,000,000	$ 340,000,000
Subsequent Event
Class of Stock [Line Items]
Payments of dividends		$ 8,000,000
Cash dividend per common share (in dollars per share) | $ / shares	$ 0.06