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Financing Arrangements - Long-term Debt Instruments (Detail) - USD ($)
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Jan. 02, 2018
Debt Instrument [Line Items]        
Borrowings under revolving lines of credit/term loans, net $ 416,614,000 $ 92,442,000 $ 424,528,000  
Current portion 0 0 0  
Long-term borrowings under senior notes 1,575,742,000 1,573,699,000 1,571,680,000  
Long-term debt, net 2,494,673,000 2,494,725,000 2,493,889,000  
Equipment financing facilities, various maturities through September 2021 [1] 9,068,000 11,222,000 13,347,000  
Capital lease obligations, various maturities through November 2021 [2] 9,747,000 12,378,000 14,863,000  
Long-term obligations under equipment financing and other, net 8,527,000 13,639,000 18,313,000  
Senior Notes, Matures October 2023 [Member]        
Debt Instrument [Line Items]        
Senior Notes [3] 294,246,000 293,607,000 292,967,000  
Senior Notes, Matures November 2025 [Member]        
Debt Instrument [Line Items]        
Senior Notes [4] 1,281,496,000 1,280,092,000 1,278,713,000  
Equipment Financing Facilities and Other [Member]        
Debt Instrument [Line Items]        
Current portion (10,288,000) (9,961,000) (9,897,000)  
Long-term obligations under equipment financing and other, net 8,527,000 13,639,000 18,313,000  
Revolving Lines of Credit [Member]        
Debt Instrument [Line Items]        
Borrowings under revolving lines of credit/term loans, net 416,614,000 92,442,000 424,528,000  
Revolving Lines of Credit [Member] | 2023 ABL [Member]        
Debt Instrument [Line Items]        
Borrowings under revolving lines of credit/term loans, net 416,600,000      
Revolving Lines of Credit [Member] | 2023 ABL [Member] | U.S. [Member]        
Debt Instrument [Line Items]        
Total Borrowings under revolving lines of credit/term loans [5] 414,369,000 89,352,000 424,528,000  
Revolving Lines of Credit [Member] | 2023 ABL [Member] | Canada [Member]        
Debt Instrument [Line Items]        
Total Borrowings under revolving lines of credit/term loans [6] 2,245,000 3,090,000    
Term Loan [Member]        
Debt Instrument [Line Items]        
Current portion (9,700,000) (9,700,000) (9,700,000)  
Borrowings under revolving lines of credit/term loans, net 918,931,000 921,026,000 922,209,000  
Term Loan [Member] | Term Loan, Matures January 2025 [Member]        
Debt Instrument [Line Items]        
Total Borrowings under revolving lines of credit/term loans $ 928,631,000 [7] $ 930,726,000 [7] $ 931,909,000 [7] $ 970,000,000
[1] Fixed interest rates ranging from 2.33% to 3.25% for all periods presented.
[2] Fixed interest rates ranging from 2.72% to 10.39% for all periods presented.
[3] Interest rate of 6.38% for all periods presented.
[4] Interest rate of 4.88% for all periods presented.
[5] Effective rate on borrowings of 4.27%, 3.36% and 3.41% as of March 31, 2019, September 30, 2018 and March 31, 2018, respectively.
[6] Effective rate on borrowings of 4.45% and 3.95% as of March 31, 2019 and September 30, 2018, respectively.
[7] Interest rate of 4.75%, 4.53% and 3.94% as of March 31, 2019, September 30, 2018 and March 31, 2018, respectively.