CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 14,407us-gaap_NetIncomeLoss	$ 16,977us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,107	8,167
Share-based compensation	8,794us-gaap_ShareBasedCompensation	7,235us-gaap_ShareBasedCompensation
Deferred income taxes	5,676us-gaap_DeferredIncomeTaxExpenseBenefit	(1,576)us-gaap_DeferredIncomeTaxExpenseBenefit
Tax effect from share-based payment arrangements	6,379	4,196
Excess tax benefits from share-based payment arrangements	(6,485)	(4,551)
Provision for doubtful accounts, net	0us-gaap_ProvisionForDoubtfulAccounts	278us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities:
Accounts receivable	5,863	2,755
Prepaid expenses and other assets	(8,843)	1,344
Accounts payable	3,886	1,848
Accrued compensation and employee benefits	(26,046)	(10,880)
Other liabilities	(13,850)	4,686
Deferred revenue	3,472	(2,101)
Net cash provided by operating activities	1,360	28,378
Cash flows from investing activities:
Purchases of property and equipment	(5,667)	(2,154)
Distribution from cost method investees	75	0
Net cash used in investing activities	(5,592)	(2,154)
Cash flows from financing activities:
Proceeds from revolving line of credit	81,000us-gaap_ProceedsFromLinesOfCredit	8,000us-gaap_ProceedsFromLinesOfCredit
Payments on revolving line of credit	(20,000)us-gaap_RepaymentsOfShortTermDebt	0us-gaap_RepaymentsOfShortTermDebt
Proceeds from issuance of treasury stock under employee stock plans	6,713	10,832
Taxes paid related to net share settlement of equity awards	(15,007)	(8,821)
Dividends paid	(635)us-gaap_PaymentsOfDividendsCommonStock	(694)us-gaap_PaymentsOfDividendsCommonStock
Repurchases of common stock	(60,593)	(27,125)
Excess tax benefits from share-based payment arrangements	6,485	4,551
Net cash used in financing activities	(2,037)	(13,257)
Effect of exchange rate changes on cash	(4,155)	(208)
Increase (decrease) in cash and cash equivalents	(10,424)	12,759
Cash and cash equivalents, beginning of period	105,075	83,178
Cash and cash equivalents, end of period	94,651	95,937
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds	8,844us-gaap_IncomeTaxesPaidNet	1,285us-gaap_IncomeTaxesPaidNet
Cash paid for interest	7,539us-gaap_InterestPaid	7,472us-gaap_InterestPaid
Supplemental disclosures of non-cash investing and financing activities:
Purchase of property and equipment included in accounts payable	$ 296	$ 521

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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Balance Type:	debit
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- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Details

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