What are total fixed assets as a percentage of total assets?September 30, 2023 September 24, 2022 ASSETS: Current assets: Cash and cash equivalents $ 29,965 $ 23,646 Marketable securities 31,590 24,658 Accounts receivable, net 29,508 28,184 Vendor non-trade receivables 31,477 32,748 Inventories 6,331 4,946 Other current assets 14,695 21,223 Total current assets 143,566 135,405 Non-current assets: Marketable securities 100,544 120,805 Property, plant and equipment, net 43,715 42,117 Other non-current assets 64,758 54,428 Total non-current assets 209,017 217,350 Total assets $ 352,583 $ 352,755