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Quarterly Data (unaudited) (Tables)
 12 Months Ended
Sep. 30, 2012
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
The following quarterly information includes all adjustments (consisting only of normal recurring adjustments) which we consider necessary for a fair presentation of such information. Quarterly results fluctuate because of the seasonal nature of the Company’s businesses.
 
December 31,
 
March 31,
 
June 30,
 
September 30,
 
2011
 
2010
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Revenues
$
280,641

 
$
350,516

 
$
345,802

 
$
484,465

 
$
143,644

 
$
172,714

 
$
114,246

 
$
129,671

Operating income
$
64,605

 
$
78,880

 
$
88,447

 
$
104,109

 
$
25,300

 
$
19,486

 
$
7,031

 
$
8,946

Net income (loss)
$
32,668

 
$
41,074

 
$
47,871

 
$
60,163

 
$
8,460

 
$
5,478

 
$
(1,101
)
 
$
(1,519
)