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CONSOLIDATED BALANCE SHEETS (Parenthetical) £ in Thousands, $ in Thousands	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 GBP (£) £ / shares shares	Mar. 31, 2018 USD ($) shares
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current | $	$ 9,645		$ 12,472	[1]
Serial preferred shares authorized	50,000,000	100,000	100,000
Serial preferred shares issued	0	100,000	100,000
Preferred Stock, Shares Outstanding	0	100,000	100,000
Preferred Stock, Par or Stated Value Per Share | (per share)	$ 0.001	£ 0.10
Aggregate Amount of Shares Authorized	$ 500,000	£ 17,006
Common shares issued	84,517,000	84,747,000	84,747,000
Common shares outstanding	84,517,000	84,747,000	84,747,000
Common Stock, Par or Stated Value Per Share | (per share)	$ 75.00	£ 0.10
[1] Net allowance for doubtful accounts and allowance for sales and returns.

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