Condensed Consolidating Financial Statements of Guarantors - Balance Sheet (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Parent Company Balance Sheets
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Net income (loss)	$ 3,937	$ 35,907
Current assets:
Cash and cash equivalents	204,925	212,047	$ 303,350	$ 139,488
Accounts receivable, net	189,224		198,693
Inventories	855,193		844,223
Deferred income taxes	56,425		56,194
Other current assets	74,392		59,831
Total current assets	1,380,159		1,462,291
Property, plant and equipment, net	573,826		605,708
Goodwill	1,200,501		1,118,020
Other intangible assets, net	1,714,112		1,664,538
Other assets	32,729		17,852
Total assets	4,901,327		4,868,409
Current liabilities:
Current portion long-term debt	59,814		34,496
Accounts payable	311,138		282,479
Accrued expenses and other current liabilities	199,145		249,561
Total current liabilities	570,097		566,536
Long-term debt, net of current portion	2,085,689		2,129,158
Deferred income taxes	723,201		701,694
Other liabilities	41,179		39,275
Total liabilities	3,420,166		$ 3,436,663
Noncontrolling interest	$ 103,511
Commitments and contingencies
Stockholders' equity:
Common stock
Capital in excess of par	$ 1,507,408		$ 1,542,584
(Accumulated deficit) retained earnings			(1,136)
Accumulated other comprehensive income (loss)	(129,758)		(109,702)
Total stockholders' equity	1,377,650		1,431,746
Total liabilities and stockholders' equity	4,901,327		4,868,409
Reportable Legal Entities | Parent Company
Condensed Parent Company Balance Sheets
Net income (loss)	3,937	35,907
Current assets:
Cash and cash equivalents	133,351	136,850	164,443	77,550
Intercompany	14,632		29,258
Other current assets	876		876
Total current assets	148,859		194,577
Property, plant and equipment, net	122,812		120,977
Other assets	15,021		7,728
Intercompany loan receivable	2,438,594		2,497,035
Investments in subsidiaries	2,238,210		2,078,945
Total assets	4,963,496		4,899,262
Current liabilities:
Current portion long-term debt	30,000		33,498
Accrued expenses and other current liabilities	16,806		31,971
Total current liabilities	46,806		65,469
Intercompany loan payable	1,400,732		1,319,331
Long-term debt, net of current portion	2,034,797		2,082,716
Total liabilities	3,482,335		$ 3,467,516
Noncontrolling interest	103,511
Commitments and contingencies
Stockholders' equity:
Capital in excess of par	1,507,408		$ 1,542,584
(Accumulated deficit) retained earnings			(1,136)
Accumulated other comprehensive income (loss)	(129,758)		(109,702)
Total stockholders' equity	1,377,650		1,431,746
Total liabilities and stockholders' equity	4,963,496		4,899,262
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Parent Company Balance Sheets
Net income (loss)	2,532	24,986
Current assets:
Cash and cash equivalents	3,670	3,674	1,344	751
Accounts receivable, net	132,087		149,423
Inventories	602,699		630,013
Deferred income taxes	56,352		56,119
Other current assets	35,003		24,148
Total current assets	829,811		861,047
Property, plant and equipment, net	218,721		266,401
Goodwill	720,812		720,813
Other intangible assets, net	1,331,187		1,341,784
Other assets	17,658		10,066
Intercompany loan receivable	1,400,732		1,319,331
Investments in subsidiaries	146,921		146,539
Total assets	4,665,842		4,665,981
Current liabilities:
Accounts payable	202,683		188,599
Intercompany	86,306		114,771
Accrued expenses and other current liabilities	125,668		137,817
Total current liabilities	414,657		441,187
Intercompany loan payable	2,064,797		2,116,214
Deferred income taxes	619,710		613,165
Other liabilities	14,133		12,731
Total liabilities	3,113,297		$ 3,183,297
Commitments and contingencies
Stockholders' equity:
Capital in excess of par	1,455,848		$ 1,404,431
(Accumulated deficit) retained earnings	116,857		96,025
Accumulated other comprehensive income (loss)	(20,160)		(17,772)
Total stockholders' equity	1,552,545		1,482,684
Total liabilities and stockholders' equity	4,665,842		4,665,981
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Parent Company Balance Sheets
Net income (loss)	24,564	35,696
Current assets:
Cash and cash equivalents	67,904	71,523	137,563	$ 61,187
Accounts receivable, net	57,137		49,270
Intercompany	71,674		85,513
Inventories	252,494		214,210
Deferred income taxes	73		75
Other current assets	38,513		34,807
Total current assets	487,795		521,438
Property, plant and equipment, net	232,293		218,330
Goodwill	479,689		397,207
Other intangible assets, net	382,925		322,754
Other assets	50		58
Total assets	1,582,752		1,459,787
Current liabilities:
Current portion long-term debt	29,814		998
Accounts payable	108,455		93,880
Accrued expenses and other current liabilities	56,671		79,773
Total current liabilities	194,940		174,651
Intercompany loan payable	373,797		380,821
Long-term debt, net of current portion	50,892		46,442
Deferred income taxes	103,491		88,529
Other liabilities	27,046		26,544
Total liabilities	750,166		$ 716,987
Noncontrolling interest	103,511
Commitments and contingencies
Stockholders' equity:
Capital in excess of par	746,911		$ 746,911
(Accumulated deficit) retained earnings	98,407		92,282
Accumulated other comprehensive income (loss)	(116,243)		(96,393)
Total stockholders' equity	729,075		742,800
Total liabilities and stockholders' equity	1,582,752		1,459,787
Eliminations
Condensed Parent Company Balance Sheets
Net income (loss)	(27,096)	$ (60,682)
Current assets:
Intercompany	(86,306)		(114,771)
Total current assets	(86,306)		(114,771)
Intercompany loan receivable	(3,839,326)		(3,816,366)
Investments in subsidiaries	(2,385,131)		(2,225,484)
Total assets	(6,310,763)		(6,156,621)
Current liabilities:
Intercompany	(86,306)		(114,771)
Total current liabilities	(86,306)		(114,771)
Intercompany loan payable	(3,839,326)		(3,816,366)
Total liabilities	(3,925,632)		$ (3,931,137)
Noncontrolling interest	(103,511)
Commitments and contingencies
Stockholders' equity:
Capital in excess of par	(2,202,759)		$ (2,151,342)
(Accumulated deficit) retained earnings	(215,264)		(188,307)
Accumulated other comprehensive income (loss)	136,403		114,165
Total stockholders' equity	(2,281,620)		(2,225,484)
Total liabilities and stockholders' equity	$ (6,310,763)		$ (6,156,621)