Quarterly report pursuant to Section 13 or 15(d)

Supplemental Disclosures

Supplemental Disclosures
3 Months Ended
Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]  
Supplemental Disclosures Supplemental Disclosures
Under a resolution adopted in June 2018, the Board of Directors authorized the purchase, at management's discretion, of up to $200 million of our common stock. During the three months ended December 31, 2019, we purchased 26,000 of our common shares at a cost of $1.9 million. During the three months ended December 31, 2018, we acquired approximately 654,000 common shares at a cost of $41.3 million. At December 31, 2019, $144.1 million remained available for future stock purchases. Subsequent to December 31, 2019, we have purchased a further 30,000 shares at a cost of $2.2 million.
During the three months ended December 31, 2019, we granted 287,000 restricted stock units to our board of directors and employees. These awards will vest ratably over one and five years, respectively.
Our deferred compensation plan uses both mutual fund and life insurance investments to fund its obligations. The mutual funds are recorded at fair value, based upon quoted prices in active markets, and the life insurance investments at cash surrender value; changes in value are reported in our consolidated statements of operations. At December 31, 2019, the deferred compensation plan held $22.1 million of the mutual fund investments.
The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and other amounts included within current assets and liabilities that meet the definition of a financial instrument are shown at values equivalent to fair value due to the short-term nature of these items. Our accounts receivable billed and billable balance includes both amounts invoiced and amounts that are ready to be invoiced where the funds are collectible within standard invoice terms. Our accounts receivable unbilled balance includes balances where revenue has been
earned but no invoice was issued on or before December 31, 2019. Restricted cash represents funds which are held in our bank accounts but which we are precluded from using for general business needs through contractual requirements; these requirements include serving as collateral for lease, credit card or letter of credit arrangements or where we hold funds on behalf of clients. Restricted cash is included within "prepaid expenses and other assets" on our balance sheet and is included within "cash, cash equivalents and restricted cash" in our consolidated statements of cash flows. A reconciliation of these balances is shown below.
  Balance as of
(dollars in thousands) December 31,
September 30, 2019 December 31,
September 30, 2018
Cash and cash equivalents $ 149,515    $ 105,565    $ 54,736    $ 349,245   
Restricted cash (recorded within "other current assets") 11,434    10,927    7,358    7,314   
Cash, cash equivalents and restricted cash 160,949    116,492    62,094    356,559   

During the three months ended December 31, 2019 and 2018, we made interest payments of $0.2 million and $0.2 million, respectively.
During the three months ended December 31, 2019 and 2018, we made income tax payments of $6.3 million and $7.1 million, respectively.