Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Cash flows from operating activities:
Net income	$ 67,573us-gaap_NetIncomeLoss	$ 57,300us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	6,788us-gaap_Depreciation	6,393us-gaap_Depreciation
Amortization of intangible assets	7,656us-gaap_AdjustmentForAmortization	6,128us-gaap_AdjustmentForAmortization
Impairment charges		710
Deferred income tax provision (benefit)	(1,679)	4,102
Gain on disposal of bus business		(7,079)us-gaap_GainLossOnSaleOfBusiness
Gain on disposition of property, plant and equipment	(78)	(40)
Stock-based compensation expense	3,327us-gaap_ShareBasedCompensation	2,648us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based awards	(114)	(796)
Changes in assets and liabilities (excluding acquisitions and disposition):
Accounts receivable	(17)	30,249
Inventories	(15,477)us-gaap_IncreaseDecreaseInInventories	(67,997)us-gaap_IncreaseDecreaseInInventories
Prepaid income taxes, expenses and other	(10,391)	(14,550)
Accounts payable	10,120	(7,159)
Accrued liabilities	(12,139)	(22,772)
Other liabilities	(2,407)	(4,982)
Net cash provided by (used in) operating activities	53,162	(17,845)
Cash flows from investing activities:
Purchases of property, plant and equipment	(16,161)	(12,671)
Proceeds from dispositions of property, plant and equipment	41	561
Proceeds from dispositions of investments		700
Proceeds from notes receivable	1,400	6,425
Proceeds from sale of bus business		100,000
Acquisitions, net of cash acquired	(49,265)	(33,487)
Other	15	340
Net cash provided by (used in) investing activities	(63,970)	61,868
Cash flows from financing activities:
Regular cash dividends paid	(28,824)us-gaap_PaymentsOfDividendsCommonStock	(24,510)us-gaap_PaymentsOfDividendsCommonStock
Special cash dividend paid		(53,290)
Excess tax benefits from stock-based awards	114	796
Proceeds from issuance of common stock		2,491
Payments related to vesting of stock-based awards	(1,562)	(1,251)
Net cash used in financing activities	(30,272)	(75,764)
Net decrease in cash and cash equivalents	(41,080)	(31,741)
Cash and cash equivalents, beginning of period	289,336	236,601
Cash and cash equivalents, end of period	248,256	204,860
Supplemental cash flow information:
Income taxes paid	59,547us-gaap_IncomeTaxesPaid	54,698us-gaap_IncomeTaxesPaid
Interest paid	1us-gaap_InterestPaid	132us-gaap_InterestPaid
Non-cash transactions:
Capital expenditures in accounts payable	220	811
Other accounts receivable from disposal of bus business		$ 5,043

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the proceeds from sale of notes receivable, as well as principal collections from a borrowing supported by a written promise to pay an obligation (note receivable).

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleAndCollectionOfNotesReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Details

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