Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands	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, 2008							$ 998,196	$ 493	$ 140,990	$ 839,068	$ 17,645
Balance (in shares) at Sep. 30, 2008								61,599
Components of comprehensive income (loss):
Net income							145,729			145,729		145,729
Foreign currency translation adjustment and other, net of taxes							(16,108)				(16,108)	(16,108)
Change in fair value of interest rate and cross currency swaps, net of taxes							(4,889)				(4,889)	(4,889)
Comprehensive income (loss):							124,732					124,732
Exercise of stock options							1,446	2	1,444
Exercise of stock options (in shares)								275
Tax benefit from exercise of stock options							55		55
Stock-based compensation							3,396		3,396
Balance at Sep. 30, 2009							1,127,825	495	145,885	984,797	(3,352)
Balance (in shares) at Sep. 30, 2009								61,874
Components of comprehensive income (loss):
Net income							213,670			213,670		213,670
Foreign currency translation adjustment and other, 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
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
Increase (Decrease) in Stockholders' Equity
Purchase accounting adjustments	(1,379,953)	(508)	(186,248)	(1,198,467)	5,270
Purchase accounting adjustments (in shares)		(63,444)
Components of comprehensive income (loss):
Net income	29,919			29,919		29,919
Foreign currency translation adjustment and other, 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
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