Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities
Net income	$ 47,814	$ 42,901
Adjustments to reconcile net income to net cash provided by operating activities
Amortization of intangible assets	3,309	1,845
Depreciation	2,410	2,786
Amortization of deferred financing costs	6,367	1,600
Bad debt and sales return reserve	(441)	(368)
Non-cash foreign currency exchange	557	100
Non-cash stock-based compensation	1,875	691
Excess tax benefit related to stock options exercised	(1,005)	(1,778)
Change in fair value of derivative		(1,329)
Deferred income tax provision	6,320	4,017
Loss on fixed asset disposal		349
Changes in assets and liabilities
Accounts receivable	(22,218)	(10,099)
Income taxes receivable	11,099	(3,024)
Inventories	(36,486)	(18,073)
Prepaid expenses and other assets	(4,023)	(2,575)
Accounts payable	14,347	14,856
Accrued expenses and other liabilities	(1,945)	(5,156)
Income taxes payable	4,013	784
Net cash provided by operating activities	31,993	27,527
Cash flows from investing activities
Purchases of property and equipment	(1,189)	(1,192)
Proceeds from sale of equipment		2,759
Net cash provided by (used in) investing activities	(1,189)	1,567
Cash flows from financing activities
Proceeds from issuance of long-term debt	625,000
Repayment of long-term debt	(649,500)	(25,000)
Financing Fees	(7,274)
Repayment of capital lease obligations	(654)	(1,037)
Excess tax benefit related to stock options exercised	1,005	1,778
Proceeds from exercise of stock options	2,994	4,782
Payment for treasury stock	(8,452)
Net cash used in financing activities	(36,881)	(19,477)
Effect of foreign currency exchange rates on cash and cash equivalents	(894)	100
Net increase (decrease) in cash and cash equivalents	(6,971)	9,717
Cash and cash equivalents, beginning of period	60,856	45,525
Cash and cash equivalents, end of period	$ 53,885	$ 55,242