Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Accrued expenses	[1]	$ 98,279	$ 125,119
Property, Plant and Equipment, Net [Abstract]
Property and equipment, accumulated depreciation		$ 867,313	$ 866,614
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, authorized shares		10,000,000	10,000,000
Preferred stock, issued shares		0	0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, par value (in dollars per share)		$ 0.009996718205	$ 0.009992761427
Common stock, authorized shares		175,000,000	175,000,000
Common stock, issued shares		57,818,975	56,641,000

[1] Period ended March 31, 2018 adjusted due to the adoption of Accounting Standard Codification (“ASC”) 606, Revenue from Contracts with Customers (“ASC 606”). Refer to Note 1, “Basis of Financial Statement Presentation.”