Company's Debt Maturities on Calendar Year Basis (Detail) $ in Thousands	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Total	$ 1,027,028
October 1 through December 31, 2017	241,972
2018	329,146
2019	42,693
2020	133,122
2021	42,693
Thereafter	237,402
Senior Secured Notes
Debt Instrument [Line Items]
Total	418,847
October 1 through December 31, 2017	10,673
2018	42,693
2019	42,693
2020	42,693
2021	42,693
Thereafter	237,402
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Total	230,929	[1]
2018	230,929	[1]
Variable Funding Notes
Debt Instrument [Line Items]
Total	90,429	[2]
2020	90,429	[2]
2017 Senior Secured Term Loan
Debt Instrument [Line Items]
Total	286,823	[3]
October 1 through December 31, 2017	231,299	[3]
2018	$ 55,524	[3]

[1] Reflects the net debt carrying amount of the 1.50% Convertible Notes in the unaudited condensed consolidated balance sheet as of September 30, 2017, in accordance with accounting for convertible notes. After taking into effect the total $163.8 million ($104.9 million in FY 2016 and $58.9 million of repurchases in the Current Quarter) of the 1.50% Convertible Notes as discussed above, the remaining principal amount owed to the holders of the 1.50% Convertible Notes is $236.2 million.

[2] Reflects the net debt carrying amount, effected by the outstanding balance of the original issue discount, in the unaudited condensed consolidated balance sheet as of September 30, 2017. The actual principal outstanding balance of the Variable Funding Notes is $100.0 million as of September 30, 2017.

[3] Reflects the net debt carrying amount, effected by the outstanding balance of the original issue discount, in the unaudited condensed consolidated balance sheet as of September 30, 2017. The actual principal outstanding balance of the 2017 Senior Secured Term Loan is $298.5 million as of September 30, 2017. Such principal amount was subsequently reduced pursuant to the terms of the First Amendment.