Other Expense, Net (Parenthetical) (Detail) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended
		Nov. 30, 2018	Feb. 28, 2019
Other Income And Expenses [Line Items]
Loss on extinguishment of debt	[1]		$ 3,051
2.25% Convertible Senior Notes
Other Income And Expenses [Line Items]
Debt, interest rate		2.25%
Debt instrument redemption period		2018-11
Loss on extinguishment of debt		$ 3,100

[1] In connection with the redemption of all our outstanding 2.25% convertible senior notes in November 2018, we recognized a loss of $3.1 million, due to the fair value measurement of the instrument on the date of conversion.