Guarantor and Non-Guarantor Subsidiaries Financial Information - Consolidating Statement of Cash Flows Footnote Unaudited (Detail)	Mar. 31, 2020	Mar. 31, 2019
3.625% Senior Secured Notes
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate	3.625%	3.625%
4.125% Senior Secured Notes
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate	4.125%	4.125%
4.875% Senior Secured Notes
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate	4.875%	4.875%
5.625% Senior Secured Notes
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate	5.625%	5.625%