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Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Summarized financial information concerning the Company's reportable segments
Number of reportable segments | segment			3
Cost of revenue	$ 4,258,754	$ 4,197,852	$ 8,447,130	$ 8,354,645
Revenue	4,427,198	4,381,296	8,785,547	8,678,947
Gross profit	168,444	183,444	338,417	324,302
Equity in earnings of joint ventures	21,738	39,016	43,209	64,279
General and administrative expenses	(29,844)	(29,455)	(62,483)	(58,094)
Acquisition and integration expenses	(19,997)	(50,711)	(35,409)	(91,749)
Gain (loss) on disposal activities	572	(1,536)	572	(42,589)
Operating income (loss)	140,913	$ 140,758	284,306	$ 196,149
Segment assets	$ 13,641,041		$ 13,641,041		$ 13,669,936
Gross profit as a % of revenue	3.80%	4.20%	3.90%	3.70%
Corporate
Summarized financial information concerning the Company's reportable segments
General and administrative expenses	$ (29,900)	$ (29,500)	$ (62,500)	$ (58,200)
Acquisition and integration expenses	(20,000)	(50,700)	(35,400)	(91,700)
Operating income (loss)	(49,900)	(80,200)	(97,900)	(149,900)
Segment assets	700,900		700,900		765,300
DCS
Summarized financial information concerning the Company's reportable segments
Revenue	1,867,500	1,966,200	3,708,300	3,828,300
Gross profit	106,100	97,200	201,300	176,500
Equity in earnings of joint ventures	6,000	2,200	10,100	5,200
Gain (loss) on disposal activities	600		600
Operating income (loss)	112,700	$ 99,400	212,000	$ 181,700
Segment assets	$ 6,688,700		$ 6,688,700		6,655,700
Gross profit as a % of revenue	5.70%	4.90%	5.40%	4.60%
CS
Summarized financial information concerning the Company's reportable segments
Revenue	$ 1,732,700	$ 1,513,100	$ 3,482,900	$ 3,191,700
Gross profit	20,400	3,900	34,200	15,300
Equity in earnings of joint ventures	5,300	2,800	9,600	5,400
Gain (loss) on disposal activities		(1,600)		(42,600)
Operating income (loss)	25,700	$ 5,100	43,800	$ (21,900)
Segment assets	$ 3,593,700		$ 3,593,700		3,556,200
Gross profit as a % of revenue	1.20%	0.30%	1.00%	0.50%
MS
Summarized financial information concerning the Company's reportable segments
Revenue	$ 827,000	$ 901,900	$ 1,594,300	$ 1,658,900
Gross profit	41,900	82,300	102,900	132,500
Equity in earnings of joint ventures	10,500	34,100	23,500	53,700
Operating income (loss)	52,400	$ 116,400	126,400	$ 186,200
Segment assets	$ 2,657,700		$ 2,657,700		$ 2,692,700
Gross profit as a % of revenue	5.10%	9.10%	6.50%	8.00%
MS | Restatement Adjustment
Summarized financial information concerning the Company's reportable segments
Cost of revenue	$ 31,200		$ 62,900
Revenue	$ 33,100		$ 66,300

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