Financing Arrangements - Schedule of Maturities of Long-term Debt (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Debt Instrument [Line Items]
2020	$ 18,689
2021	14,067
2022	9,913
2023	398,833
2024	9,700
Thereafter	2,206,950
Total debt	2,658,152
Unamortized debt issuance costs	(59,270)
Total long-term debt	2,598,882
2023 ABL [Member]
Debt Instrument [Line Items]
2020	0
2021	0
2022	0
2023	89,104
2024	0
Thereafter	0
Total debt	89,104
Unamortized debt issuance costs	(8,143)
Total long-term debt	80,961
2025 Term Loan [Member]
Debt Instrument [Line Items]
2020	9,700
2021	9,700
2022	9,700
2023	9,700
2024	9,700
Thereafter	906,950
Total debt	955,450
Unamortized debt issuance costs	(28,915)
Total long-term debt	926,535
Equipment Financing and Other [Member]
Debt Instrument [Line Items]
2020	8,989
2021	4,367
2022	213
2023	29
2024	0
Thereafter	0
Total debt	13,598
Unamortized debt issuance costs	0
Total long-term debt	13,598
Senior Notes [Member]
Debt Instrument [Line Items]
2020	0	[1]
2021	0	[1]
2022	0	[1]
2023	300,000	[1]
2024	0	[1]
Thereafter	1,300,000	[1]
Total debt	1,600,000	[1]
Unamortized debt issuance costs	(22,212)	[1]
Total long-term debt	$ 1,577,788	[1]

[1] Represent principal amounts for 2023 Senior Notes and 2025 Senior Notes. In October 2019, the 2023 Senior Notes were fully redeemed and replaced in connection with re-financing efforts (see Note 20 for additional information).