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Long-Term Debt Long-Term Debt Schedule (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Debt Instrument [Line Items] |  |
Secured Debt | $ 334,563 us-gaap_SecuredDebt | $ 415,125 us-gaap_SecuredDebt
Revolving Credit Facility due May 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Secured Debt | 0 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = asgn_RevolvingCreditFacilitydueMay2018Member | 76,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = asgn_RevolvingCreditFacilitydueMay2018Member
Term-A Loan Facility due May 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Secured Debt | 154,251 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = asgn_TermALoanFacilitydueMay2018Member | 158,813 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = asgn_TermALoanFacilitydueMay2018Member
Term-B Loan Facility due May 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Secured Debt | $ 180,312 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = asgn_TermBLoanFacilitydueMay2020Member | $ 180,312 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = asgn_TermBLoanFacilitydueMay2020Member

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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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