BANKRUPTCY AND RELATED MATTERS Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 31, 2019 Multiplier $ / shares shares	Sep. 30, 2019 USD ($) Employee $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Employee $ / shares shares	Sep. 30, 2018 USD ($)	Dec. 06, 2019 shares	Mar. 31, 2019 $ / shares shares
Reorganizations [Abstract]
Executive Key Employee Incentive Plan, Number Of Employee | Employee		10		10
Executive Key Employee Incentive Plan, Potential Cash Award, Threshold		$ 3,100		$ 3,100
Executive Key Employee Incentive Plan, Potential Cash Award, Target		6,100		6,100
Executive Key Employee Incentive Plan, Potential Cash Award, Exceed Target		$ 12,300		$ 12,300
Non-Executive Key Employee Incentive Plan, Number Of Employee | Employee		183		183
Non-Executive Key Employee Incentive Plan, Potential Cash Award, Threshold		$ 7,700		$ 7,700
Non-Executive Key Employee Incentive Plan, Potential Cash Award, Target		10,300		10,300
Non-Executive Key Employee Incentive Plan, Potential Cash Award, Exceed Target		$ 15,400		$ 15,400
Common stock, par value (in dollars per share) | $ / shares		$ 0.01		$ 0.01			$ 0.01
Common stock, shares authorized | shares		90,000,000		90,000,000			90,000,000
Prepetition restructuring charges		$ 0	$ 0	$ 13,476	$ 0
Cash outflow for reorganizations items		$ 14,300		$ 15,700
Management Service, Incentive [Member] | Subsequent Event [Member]
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.0001
Common stock, shares authorized | shares	473,218					699,890
Preferred Stock, Shares Authorized | shares	284,358					323,664
Common Stock Authorized, Percentage	4.00%					5.00%
Tier 1 Participant | Severance Plan And Participation Agreements [Member] | Subsequent Event [Member]
Cash Severance, Base Salary Payment Period	24 months
Tier 2 Participant | Severance Plan And Participation Agreements [Member] | Subsequent Event [Member]
Cash Severance, Base Salary Payment Period	12 months
Tier 1 and 2 Participants | Severance Plan And Participation Agreements [Member] | Subsequent Event [Member]
Severance, COBRA coverage period	18 months
Severance, Outplacement Coverage Period	12 months
Termination Benefits Occurring Within Two-Year Period Following Change in Control [Member] | Tier 1 Participant | Severance Plan And Participation Agreements [Member] | Subsequent Event [Member]
Severance, Salary Multiplier | Multiplier	2.0
Target Bonus, Percentage of Base Salary	110.00%
Termination Benefits Occurring Within Two-Year Period Following Change in Control [Member] | Tier 2 Participant | Severance Plan And Participation Agreements [Member] | Subsequent Event [Member]
Severance, Salary Multiplier | Multiplier	1.5
Target Bonus, Percentage of Base Salary	65.00%
Termination Benefits Occurring Within Two-Year Period Following Change in Control [Member] | Chief Financial Officer [Member] | Severance Plan And Participation Agreements [Member] | Subsequent Event [Member]
Target Bonus, Percentage of Base Salary	75.00%