Debt - Long-Term Debt Narrative (Details)		1 Months Ended	2 Months Ended	3 Months Ended			8 Months Ended	9 Months Ended		12 Months Ended
	Jun. 09, 2016 USD ($) tranche	Jun. 30, 2016 USD ($)	Jun. 08, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 08, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 11, 2014 USD ($)
Long-term debt
Eligible accounts receivable for monthly credit		90.00%
Eligible inventory for monthly credit		85.00%
Cash and cash equivalents held in blocked accounts		100.00%
Debt issuance cost	$ 18,300,000										$ 28,500,000
Debt instrument, unamortized discount		$ 3,300,000		$ 3,300,000				$ 3,300,000		$ 3,600,000
Long-term debt		811,300,000		811,300,000				811,300,000		904,600,000
Ryder | 2015 Ryder Lease
Long-term debt
Capital lease, future annual executory costs		2,100,000		2,100,000				2,100,000
Capital lease, aggregate executory costs		13,200,000		13,200,000				13,200,000
Capital lease, aggregate future interest payments		4,700,000		4,700,000				4,700,000
Ryder | 2015 Ryder Lease | Minimum
Long-term debt
Annual interest payments		300,000		300,000				300,000
Ryder | 2015 Ryder Lease | Maximum
Long-term debt
Annual interest payments		1,000,000		1,000,000				1,000,000
Predecessor ABL Facility
Long-term debt
Long-term debt		0		0				0		85,500,000
Predecessor Term Loan Facility
Long-term debt
Debt instrument, unamortized discount										1,900,000
Long-term debt		0		0				0		647,200,000
Notes
Long-term debt
Repurchase amount					$ 9,500,000
Cash payments for repurchase of debt					8,700,000
Gain on repurchase of debt instrument					$ 600,000
Long-term debt		0		0				0		159,200,000
Capital lease obligations
Long-term debt
Long-term debt		25,200,000		25,200,000				25,200,000		12,700,000
New ABL Facility
Long-term debt
Line of credit facility excess availability		$ 40,250,000		$ 40,250,000				$ 40,250,000
Line of credit facility, capacity		10.00%
Fixed charge coverage ratio		1.0		1.0				1.0
Weighted average rate of interest		2.60%		2.60%				2.60%
Outstanding letters of credit		$ 73,700,000		$ 73,700,000				$ 73,700,000
Debt issuance cost		6,800,000		6,800,000				6,800,000
Long-term debt		$ 131,100,000		131,100,000				131,100,000		$ 0
New ABL Facility | Minimum
Long-term debt
Basis spread		0.25%
Line of credit facility, commitment fee		0.25%
New ABL Facility | Maximum
Long-term debt
Basis spread		0.75%
Line of credit facility, commitment fee		0.375%
New ABL Facility | LIBOR or Canadian BA Rate | Minimum
Long-term debt
Basis spread		1.25%
New ABL Facility | LIBOR or Canadian BA Rate | Maximum
Long-term debt
Basis spread		1.75%
New ABL Facility | US Tranche
Long-term debt
Line of credit facility, maximum borrowing capacity	505,000,000.0
New ABL Facility | US Tranche | Swingline Loan
Long-term debt
Line of credit facility, maximum borrowing capacity	50,000,000.0
New ABL Facility | Canadian Tranche
Long-term debt
Line of credit facility, maximum borrowing capacity	40,000,000.0
New ABL Facility | Canadian Tranche | Swingline Loan
Long-term debt
Line of credit facility, maximum borrowing capacity	10,000,000.0
New ABL Facility | FILO Tranche
Long-term debt
Line of credit facility, maximum borrowing capacity	30,000,000.0
Remaining availability		$ 0		0				0
New ABL Facility | FILO Tranche | Minimum
Long-term debt
Basis spread		1.00%
New ABL Facility | FILO Tranche | Maximum
Long-term debt
Basis spread		1.50%
New ABL Facility | FILO Tranche | LIBOR | Minimum
Long-term debt
Basis spread		2.00%
New ABL Facility | FILO Tranche | LIBOR | Maximum
Long-term debt
Basis spread		2.50%
New ABL Facility | U.S. and Canadian Tranches
Long-term debt
Remaining availability		$ 125,200,000		125,200,000				125,200,000
New Term Loan Facility
Long-term debt
Line of credit facility, maximum borrowing capacity	655,000,000
Line of credit facility, increase in maximum borrowing capacity	$ 175,000,000.0
Basis spread		4.25%
Debt issuance cost		$ 18,500,000		$ 18,500,000				$ 18,500,000
Net leverage ratio of available amount	4.1
Interest rate for term loan facility	1.00%	5.25%		5.25%				5.25%
Percentage of aggregate annual amount to be paid every quarter										1.00%
Proceeds from lines of credit		$ 651,700,000
Debt instrument, unamortized discount		3,300,000		$ 3,300,000				$ 3,300,000
Long-term debt		$ 655,000,000		655,000,000				655,000,000		$ 0
New Term Loan Facility | LIBOR
Long-term debt
Basis spread		1.00%
New Term Loan Facility | Federal Funds Effective Rate
Long-term debt
Basis spread		0.50%
New Term Loan Facility | One Month London Interbank Offered Rate
Long-term debt
Basis spread		3.25%
Letter of Credit | US Tranche
Long-term debt
Line of credit facility, maximum borrowing capacity		$ 200,000,000.0		200,000,000.0				200,000,000.0
Letter of Credit | Canadian Tranche
Long-term debt
Line of credit facility, maximum borrowing capacity		10,000,000.0		10,000,000.0				10,000,000.0
Letter of Credit | FILO Tranche
Long-term debt
Line of credit facility, maximum borrowing capacity		30,000,000.0		30,000,000.0				30,000,000.0
Successor
Long-term debt
Debt issuance cost		25,300,000		25,300,000				25,300,000
Successor | New ABL Facility
Long-term debt
Amount as collateral to the banking institution		601,100,000		601,100,000				601,100,000
Amortization of financing costs				100,000				100,000
Successor | New Term Loan Facility
Long-term debt
Debt instrument, unamortized discount		3,300,000		3,300,000				3,300,000
Amortization of financing costs				100,000				100,000
Predecessor | Predecessor ABL Facility
Long-term debt
Weighted average rate of interest										1.80%
Outstanding letters of credit										$ 67,400,000
Remaining availability										$ 321,400,000
Debt issuance cost		(3,300,000)		(3,300,000)				(3,300,000)
Terminated line of credit amount	$ 540,000,000
Line of credit facility outstanding amount	0
Predecessor | Predecessor Term Loan Facility
Long-term debt
Debt issuance cost		(4,600,000)		(4,600,000)				(4,600,000)
Terminated line of credit amount	$ 617,500,000
Number of tranches | tranche	3
Predecessor | Notes
Long-term debt
Debt issuance cost		$ (1,400,000)		$ (1,400,000)				$ (1,400,000)
Repurchase amount	$ 149,700,000
Redemption price	100.00%
Predecessor | New ABL Facility
Long-term debt
Amortization of financing costs			$ 600,000			$ 800,000	$ 2,100,000		$ 2,300,000
Predecessor | New Term Loan Facility
Long-term debt
Amortization of financing costs			$ 800,000			$ 1,000,000	$ 3,000,000		$ 3,100,000