Consolidated Statements of Stockholder's Equity and Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Capital in Excess of Par	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Comprehensive Income (Loss)	Predecessor	Predecessor Common Stock	Predecessor Capital in Excess of Par	Predecessor Retained Earnings	Predecessor Accumulated Other Comprehensive Income (Loss)	Predecessor Comprehensive Income (Loss)
Balance at Sep. 30, 2009							$ 1,127,825	$ 495	$ 145,885	$ 984,797	$ (3,352)
Balance (in shares) at Sep. 30, 2009								61,874,000
Components of comprehensive income (loss):
Net income							213,670			213,670		213,670
Foreign currency translation adjustment, net of taxes							(4,600)				(4,600)	(4,600)
Change in fair value of interest rate and cross currency swaps, net of taxes							2,682				2,682	2,682
Comprehensive income (loss):							211,752					211,752
Exercise of stock options							10,621	13	10,608
Exercise of stock options (in shares)								1,570,000
Tax benefit from exercise of stock options							6,646		6,646
Stock-based compensation							23,109		23,109
Balance at Sep. 30, 2010							1,379,953	508	186,248	1,198,467	(5,270)
Balance (in shares) at Sep. 30, 2010								63,444,000
Increase (Decrease) in Stockholders' Equity
Acquisition accounting adjustments							(1,379,953)	(508)	(186,248)	(1,198,467)	5,270
Acquisition accounting adjustments (in shares)								(63,444,000)
Components of comprehensive income (loss):
Net income	29,919			29,919		29,919
Foreign currency translation adjustment, net of taxes	(20,196)				(20,196)	(20,196)
Change in fair value of interest rate and cross currency swaps, net of taxes	(17,569)				(17,569)	(17,569)
Comprehensive income (loss):	(7,846)					(7,846)
Opening equity of Merger sub	(7,447)			(7,447)
Opening equity of Merger sub (in shares)		1,000
Capital contribution from Holdings	1,550,400		1,550,400
Stock-based compensation	1,788		1,788
Balance at Sep. 30, 2011	1,536,895		1,552,188	22,472	(37,765)
Balance (in shares) at Sep. 30, 2011		1,000
Components of comprehensive income (loss):
Net income	146,471			146,471		146,471
Foreign currency translation adjustment, net of taxes	23,107				23,107	23,107
Change in fair value of interest rate and cross currency swaps, net of taxes	(3,936)				(3,936)	(3,936)
Comprehensive income (loss):	165,642					165,642
Capital contribution from Holdings	15		15
Stock-based compensation	2,680		2,680
Balance at Sep. 30, 2012	$ 1,705,232	$ 0	$ 1,554,883	$ 168,943	$ (18,594)
Balance (in shares) at Sep. 30, 2012		1,000