Supplemental Consolidating Financial Statements - Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Apr. 25, 2015	Jul. 26, 2014	Apr. 26, 2014	Jul. 27, 2013
Current assets:
Cash and equivalents	$ 22,542	$ 20,672	$ 18,722	$ 18,607
Accounts receivable, net	265,772us-gaap_AccountsReceivableNetCurrent	272,741us-gaap_AccountsReceivableNetCurrent
Costs and estimated earnings in excess of billings	247,979	230,569
Inventories	45,205us-gaap_InventoryNet	49,095us-gaap_InventoryNet
Deferred tax assets, net	19,278us-gaap_DeferredTaxAssetsNetCurrent	19,932us-gaap_DeferredTaxAssetsNetCurrent
Other current assets	20,112us-gaap_OtherAssetsCurrent	12,727us-gaap_OtherAssetsCurrent
Total current assets	620,888us-gaap_AssetsCurrent	605,736us-gaap_AssetsCurrent
Property and equipment, net	226,328us-gaap_PropertyPlantAndEquipmentNet	205,413us-gaap_PropertyPlantAndEquipmentNet
Goodwill	269,465us-gaap_Goodwill	269,088us-gaap_Goodwill
Intangible assets, net	110,031	116,116
Deferred tax assets, net non-current	0us-gaap_DeferredTaxAssetsNetNoncurrent	0us-gaap_DeferredTaxAssetsNetNoncurrent
Investment in subsidiaries	0dy_InvestmentInWhollyOwnedSubsidiaries	0dy_InvestmentInWhollyOwnedSubsidiaries
Intercompany receivables	0dy_IntercompanyReceivablesAggregate	0dy_IntercompanyReceivablesAggregate
Other	30,404us-gaap_OtherAssetsNoncurrent	16,001us-gaap_OtherAssetsNoncurrent
Total non-current assets	636,228us-gaap_AssetsNoncurrent	606,618us-gaap_AssetsNoncurrent
Total assets	1,257,116us-gaap_Assets	1,212,354us-gaap_Assets
Current liabilities:
Accounts payable	64,463us-gaap_AccountsPayableCurrent	63,318us-gaap_AccountsPayableCurrent
Current portion of debt	0us-gaap_DebtCurrent	10,938us-gaap_DebtCurrent
Billings in excess of costs and estimated earnings	14,271	13,882
Accrued insurance claims	38,036dy_AccruedInsuranceClaimsCurrent	32,260dy_AccruedInsuranceClaimsCurrent
Deferred tax liabilities	0us-gaap_DeferredTaxLiabilitiesCurrent	0us-gaap_DeferredTaxLiabilitiesCurrent
Other accrued liabilities	78,224us-gaap_OtherAccruedLiabilitiesCurrent	76,134us-gaap_OtherAccruedLiabilitiesCurrent
Total current liabilities	194,994us-gaap_LiabilitiesCurrent	196,532us-gaap_LiabilitiesCurrent
Long-term debt	446,692	446,863
Accrued insurance claims	39,487dy_AccruedInsuranceClaimsNoncurrent	33,782dy_AccruedInsuranceClaimsNoncurrent
Deferred tax liabilities, net non-current	48,815	45,361
Intercompany payables	0dy_IntercompanyPayablesAggregate	0dy_IntercompanyPayablesAggregate
Other liabilities	4,942us-gaap_OtherLiabilitiesNoncurrent	4,882us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	734,930us-gaap_Liabilities	727,420us-gaap_Liabilities
Total stockholders' equity	522,186us-gaap_StockholdersEquity	484,934us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	1,257,116	1,212,354
Parent
Current assets:
Cash and equivalents	0	0	0	0
Accounts receivable, net	0	0
Costs and estimated earnings in excess of billings	0	0
Inventories	0	0
Deferred tax assets, net	3,191	3,822
Other current assets	11,673	4,956
Total current assets	14,864	8,778
Property and equipment, net	20,272	18,108
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net non-current	375	182
Investment in subsidiaries	860,114	809,617
Intercompany receivables	0	0
Other	18,229	7,748
Total non-current assets	898,990	835,655
Total assets	913,854	844,433
Current liabilities:
Accounts payable	1,494	3,083
Current portion of debt	0	10,938
Billings in excess of costs and estimated earnings	0	0
Accrued insurance claims	166	612
Deferred tax liabilities	0	0
Other accrued liabilities	10,959	12,668
Total current liabilities	12,619	27,301
Long-term debt	166,250	166,125
Accrued insurance claims	56	778
Deferred tax liabilities, net non-current	0	0
Intercompany payables	209,597	162,127
Other liabilities	3,146	3,168
Total liabilities	391,668	359,499
Total stockholders' equity	522,186	484,934
Total liabilities and stockholders' equity	913,854	844,433
Issuer
Current assets:
Cash and equivalents	0	0	0	0
Accounts receivable, net	0	0
Costs and estimated earnings in excess of billings	0	0
Inventories	0	0
Deferred tax assets, net	0	0
Other current assets	36	16
Total current assets	36	16
Property and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net non-current	52	0
Investment in subsidiaries	2,003,652	1,540,338
Intercompany receivables	0	0
Other	5,118	5,636
Total non-current assets	2,008,822	1,545,974
Total assets	2,008,858	1,545,990
Current liabilities:
Accounts payable	0	0
Current portion of debt	0	0
Billings in excess of costs and estimated earnings	0	0
Accrued insurance claims	0	0
Deferred tax liabilities	80	80
Other accrued liabilities	5,458	566
Total current liabilities	5,538	646
Long-term debt	280,442	280,738
Accrued insurance claims	0	0
Deferred tax liabilities, net non-current	485	432
Intercompany payables	862,279	454,557
Other liabilities	0	0
Total liabilities	1,148,744	736,373
Total stockholders' equity	860,114	809,617
Total liabilities and stockholders' equity	2,008,858	1,545,990
Subsidiary Guarantors
Current assets:
Cash and equivalents	21,279	19,739	18,009	18,166
Accounts receivable, net	264,290	269,760
Costs and estimated earnings in excess of billings	246,539	228,541
Inventories	45,205	49,095
Deferred tax assets, net	16,161	16,193
Other current assets	7,716	7,237
Total current assets	601,190	590,565
Property and equipment, net	186,187	171,158
Goodwill	269,465	269,088
Intangible assets, net	109,492	115,483
Deferred tax assets, net non-current	3,556	3,884
Investment in subsidiaries	1,660	1,621
Intercompany receivables	1,082,143	628,443
Other	2,960	2,466
Total non-current assets	1,655,463	1,192,143
Total assets	2,256,653	1,782,708
Current liabilities:
Accounts payable	61,803	58,970
Current portion of debt	0	0
Billings in excess of costs and estimated earnings	14,271	13,882
Accrued insurance claims	37,827	31,599
Deferred tax liabilities	14	66
Other accrued liabilities	60,911	61,284
Total current liabilities	174,826	165,801
Long-term debt	0	0
Accrued insurance claims	39,402	32,959
Deferred tax liabilities, net non-current	51,128	48,593
Intercompany payables	0	0
Other liabilities	1,792	1,711
Total liabilities	267,148	249,064
Total stockholders' equity	1,989,505	1,533,644
Total liabilities and stockholders' equity	2,256,653	1,782,708
Non- Guarantor Subsidiaries
Current assets:
Cash and equivalents	1,263	933	713	441
Accounts receivable, net	1,482	2,981
Costs and estimated earnings in excess of billings	1,440	2,028
Inventories	0	0
Deferred tax assets, net	76	87
Other current assets	687	518
Total current assets	4,948	6,547
Property and equipment, net	19,869	16,147
Goodwill	0	0
Intangible assets, net	539	633
Deferred tax assets, net non-current	333	15
Investment in subsidiaries	0	0
Intercompany receivables	0	0
Other	4,097	151
Total non-current assets	24,838	16,946
Total assets	29,786	23,493
Current liabilities:
Accounts payable	1,166	1,265
Current portion of debt	0	0
Billings in excess of costs and estimated earnings	0	0
Accrued insurance claims	43	49
Deferred tax liabilities	56	24
Other accrued liabilities	896	1,616
Total current liabilities	2,161	2,954
Long-term debt	0	0
Accrued insurance claims	29	45
Deferred tax liabilities, net non-current	1,518	417
Intercompany payables	10,267	11,759
Other liabilities	4	3
Total liabilities	13,979	15,178
Total stockholders' equity	15,807	8,315
Total liabilities and stockholders' equity	29,786	23,493
Eliminations and Reclassifications
Current assets:
Cash and equivalents	0	0	0	0
Accounts receivable, net	0	0
Costs and estimated earnings in excess of billings	0	0
Inventories	0	0
Deferred tax assets, net	(150)	(170)
Other current assets	0	0
Total current assets	(150)	(170)
Property and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Deferred tax assets, net non-current	(4,316)	(4,081)
Investment in subsidiaries	(2,865,426)	(2,351,576)
Intercompany receivables	(1,082,143)	(628,443)
Other	0	0
Total non-current assets	(3,951,885)	(2,984,100)
Total assets	(3,952,035)	(2,984,270)
Current liabilities:
Accounts payable	0	0
Current portion of debt	0	0
Billings in excess of costs and estimated earnings	0	0
Accrued insurance claims	0	0
Deferred tax liabilities	(150)	(170)
Other accrued liabilities	0	0
Total current liabilities	(150)	(170)
Long-term debt	0	0
Accrued insurance claims	0	0
Deferred tax liabilities, net non-current	(4,316)	(4,081)
Intercompany payables	(1,082,143)	(628,443)
Other liabilities	0	0
Total liabilities	(1,086,609)	(632,694)
Total stockholders' equity	(2,865,426)	(2,351,576)
Total liabilities and stockholders' equity	$ (3,952,035)	$ (2,984,270)

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities and/or claimants to mitigate potential losses from auto liability, general liability, workers compensation, employee group health, and damage claims. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

No definition available.