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Benefit Plans | 3 Months Ended
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Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Benefit Plans | Benefit Plans Stock Plans The Company had 273.4 million shares reserved for future issuance under its stock plans as of December 30, 2017. RSUs granted generally vest over four years, based on continued employment, and are settled upon vesting in shares of the Company’s common stock on a one-for-one basis. Each share issued with respect to RSUs granted under the Company’s stock plans reduces the number of shares available for grant under the plan by two shares. RSUs canceled and shares withheld to satisfy tax withholding obligations increase the number of shares available for grant under the plans utilizing a factor of two times the number of RSUs canceled or shares withheld. Rule 10b5-1 Trading Plans During the three months ended December 30, 2017, Section 16 officers Angela Ahrendts, Timothy D. Cook, Luca Maestri, Daniel Riccio and Philip Schiller had equity trading plans in place in accordance with Rule 10b5-1(c)(1) under the Exchange Act. An equity trading plan is a written document that pre-establishes the amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of the Company’s stock, including shares acquired pursuant to the Company’s employee and director equity plans. Restricted Stock Units A summary of the Company’s RSU activity and related information for the three months ended December 30, 2017 is as follows:
| Number of RSUs (in thousands) |  | Weighted-Average Grant Date Fair Value Per Share |  | Aggregate Fair Value (in millions)
Balance as of September 30, 2017 | 97,571 |  |  | $ | 110.33 |  |  |
RSUs granted | 35,853 |  |  | $ | 157.49 |  |  |
RSUs vested | (19,741 | ) |  | $ | 102.40 |  |  |
RSUs canceled | (1,316 | ) |  | $ | 121.76 |  |  |
Balance as of December 30, 2017 | 112,367 |  |  | $ | 126.64 |  |  | $ | 19,016 |
The fair value as of the respective vesting dates of RSUs was $3.1 billion and $2.2 billion for the three months ended December 30, 2017 and December 31, 2016, respectively. Share-Based Compensation The following table shows a summary of the share-based compensation expense included in the Condensed Consolidated Statements of Operations for the three months ended December 30, 2017 and December 31, 2016 (in millions):
| Three Months Ended
| December 30, 2017 |  | December 31, 2016
Cost of sales | $ | 252 |  |  | $ | 229 |
Research and development | 646 |  |  | 589 |
Selling, general and administrative | 398 |  |  | 438 |
Total share-based compensation expense | $ | 1,296 |  |  | $ | 1,256 |
The income tax benefit related to share-based compensation expense was $631 million and $465 million for the three months ended December 30, 2017 and December 31, 2016, respectively. As of December 30, 2017, the total unrecognized compensation cost related to outstanding RSUs, restricted stock and stock options was $12.1 billion, which the Company expects to recognize over a weighted-average period of 2.9 years.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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