XML 48 R31.htm IDEA: XBRL DOCUMENT
v3.21.2

Detail of Certain Balance Sheet Accounts (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2021
Detail of Certain Balance Sheet Accounts [Abstract] |
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] |
| Year Ended September 30,
| 2021 |  | 2020
Accounts payable, trade | $ | 136,967 |  |  | $ | 93,315 |
Accrued compensation and benefits | 61,109 |  |  | 53,933
Accrued insurance liabilities | 5,787 |  |  | 6,254
Current operating lease liabilities | 13,973 |  |  | 11,056
Other accrued expenses | 31,278 |  |  | 22,152
| $ | 249,114 |  |  | $ | 186,710 |
Schedule of Other Assets [Table Text Block] |
| Year Ended September 30,
| 2021 |  | 2020
Executive Savings Plan assets | $ | 937 |  |  | $ | 766 |
Securities and equity investments | 10 |  |  | — |
Right of use asset - finance leases | 3,927 |  |  | 1,600 |
Other | 2,175 |  |  | 3,414 |
Total | $ | 7,049 |  |  | $ | 5,780 |

X
- Definition Detail of Certain Balance Sheet Accounts [Abstract] + References No definition available. + Details
Name: | iesc_DetailofCertainBalanceSheetAccountsAbstract
Namespace Prefix: | iesc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amounts of other assets. This disclosure includes other current assets and other noncurrent assets. + References No definition available. + Details
Name: | us-gaap_ScheduleOfOtherAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration